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Tài liệu đề kiểm tra đại số 9

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Trêng THCS Hång Thuû Hä vµ tªn:.......................... Líp: 9..... §iÓm: KiÓm tra bµi sè 1 - §¹i 9 Thêi gian: 45 phót. Ngµy kiÓm tra:.../....../2013 Lêi nhËn xÐt cña gi¸o viªn: §Ò I: I Tr¾c nghiÖm (2®).Khoanh trßn vµo ch÷ c¸i tríc c©u tr¶ lêi ®óng: 1.C¨n bËc hai cña 9 lµ: A. 3; B. -3; C. 81; 2.C¨n bËc hai sè häc cña 4 lµ: A. 2; B. -2; C. 16; 3.§iÒu kiÖn cña x ®Ó 2x x¸c ®Þnh lµ : A. x > 0; B. x< 0; C. x 0; 4.§iÒu kiÖn cña x ®Ó  3 x 1 a) 2  2 : 3  3 D. x 0 D. x  1 b) ( 3  2) 2  ( 3  1) 2 3 ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... C©u 2: T×m x, biÕt: (2®) a) 9 x  4 x 3 ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... C©u 3: Cho biÓu thøc: M = D. 2 x¸c ®Þnh lµ : A. x > -1; B. x< -1; C. x  -1; II Tù luËn (8®) C©u 1: T×m gi¸ trÞ cña biÓu thøc: (2®) 1 2 1 D. 3 ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... b) 4 x  4  9 x  9  36 x  36  1 ( x  1) ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... a a a a  1 a 1 a  a 0; a 1 (3®) a) Rót gän biÓu thøc M. b) T×m a ®Ó M = 4. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. C©u 4: T×m sè nghÞch ®¶o cña 2013  2014 (1®) ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. Trêng THCS Hång Thuû KiÓm tra bµi sè 1 - §¹i 9 Hä vµ tªn:.......................... Líp: 9..... §iÓm: Thêi gian: 45 phót. Ngµy kiÓm tra:.../....../2013 Lêi nhËn xÐt cña gi¸o viªn: §Ò II: I Tr¾c nghiÖm (2®).Khoanh trßn vµo ch÷ c¸i tríc c©u tr¶ lêi ®óng: 1.C¨n bËc hai cña 16 lµ: A. 4; B. 4 ; C. 256; 2.C¨n bËc hai sè häc cña 9 lµ: A. 3; B. -3; C. 81; 3.§iÒu kiÖn cña x ®Ó 3x x¸c ®Þnh lµ : A. x > 0; B. x< 0; C. x  0; D.- 4 D. 3 D. x  0 4.§iÒu kiÖn cña x ®Ó 3 x¸c ®Þnh lµ : x 1 A. x > -1; B. x< -1; C. x  -1; II Tù luËn (8®) C©u 1: T×m gi¸ trÞ cña biÓu thøc: (2®) a) 3  3 : 2  2 1 3 1 b) ( 3  1)2  ( 3  2) 2 2 ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... C©u 2: T×m x, biÕt: (2®) a) 16 x  9 x 3 ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... ...................................................... C©u 3: Cho biÓu thøc: M = D. x  1 ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... b) 16 x  16  9 x  9  64 x  64  1 ( x  1) ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... b b b b  1 b 1 b  b 0; b 1 (3®) c) Rót gän biÓu thøc M. d) T×m b ®Ó M = 4. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. C©u 4: T×m sè nghÞch ®¶o cña 2013  2014 (1®) ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ®¸p ¸n , biÓu ®iÓm §Ò I I Tr¾c nghiÖm (Mçi c©u ®óng cho 0,5®) C©u 1 2 §¸p ¸n ®óng D A II Tù luËn C©u 1 a) 3  3 : 2  2 1 3 1 4 B b) ( 3  1) 2  ( 3  2) 2 2 = 3( 3  1) : 2(1  2) 1 3  3: 2 3 D 1 (0,5®) 2 = 6 2 = 3 2  3 1 (0,25®) =2- 3 + 3 -1 (0,25®) =1 (0,5®) (0,25®) (0,25®) C©u 2.(Mçi bíc ®óng cho 0,25 ®) a) 9 x  4 x 3 b) 4 x  4  9 x  9  36 x  36  1 ( x  1) 4( x  1)  9( x  1)  36( x  1)  1  3 x  2 x 3   x 3  x 9  2 x  1  3 x  1  6 x  1  1   x  1  1  x  1 1  x 0 C©u 3.(Mçi bíc ®óng cho 0,5 ®) a) M = a a a a  1 a 1 a  a 0; a 1 M = a (1  a )  a (1  a ) 1 a M= a + a M =2 a b) M= 4  2 a  a =2 a=4 1 =4 a C©u 4 . (Mçi bíc ®óng cho 0,25 ®) Gäi sè nghÞch ®¶o cña 2010  2009 lµ x , Ta cã : x.( 2010  2009 ) =1  x = 1: ( 2010  2009 ) x= 2010  2009 (Lu ý : Häc sinh lµm theo c¸ch kh¸c nÕu ®óng vÉn cho ®iÓm tèi ®a) §Ò II I Tr¾c nghiÖm (Mçi c©u ®óng cho 0,5®) C©u 1 2 §¸p ¸n ®óng B A II Tù luËn C©u 1 a) 3  3 : 2  2 1 3 1 4 A b) ( 3  2) 2  ( 3  1) 2 2 = 3( 3  1) : 2(1  2) 1 3  3: 2 3 C 1 (0,5®) 2 = 6 2 = 3 2  3 1 (0,25®) =2- 3 + 3 -1 (0,25®) =1 (0,5®) (0,25®) (0,25®) C©u 2.(Mçi bíc ®óng cho 0,25 ®) a) 16 x  9 x 3 b) 4 x  4  9 x  9  64 x  64  1 ( x  1) 4( x  1)  9( x  1)  64( x  1)  1  4 x  3 x 3   x 3  x 9  2 x  1  3 x  1  8 x  1  1   3 x  1  1 1  x 1  3 2  x  3 C©u 3.(Mçi bíc ®óng cho 0,5 ®) b) M = b  b  b  b  b 0; b 1 1 b 1 b M = b (1  b )  b (1  b ) 1 b 1 b M= b + b M =2 b b) M= 4  2 b =4  b =2 b=4 C©u 4 . (Mçi bíc ®óng cho 0,25 ®) Gäi sè nghÞch ®¶o cña 2010  2009 lµ x , Ta cã : x.( 2010  2009 ) =1  x = 1: ( 2010  2009 ) x= 2010  2009 (Lu ý : Häc sinh lµm theo c¸ch kh¸c nÕu ®óng vÉn cho ®iÓm tèi ®a)
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