Mô tả:
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
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C©u 2: T×m x, biÕt: (2®)
a) 9 x 4 x 3
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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
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b) 4 x 4 9 x 9 36 x 36 1 ( x 1)
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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.
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C©u 4: T×m sè nghÞch ®¶o cña 2013 2014 (1®)
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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
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C©u 2: T×m x, biÕt: (2®)
a) 16 x 9 x 3
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C©u 3: Cho biÓu thøc: M =
D. x 1
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b) 16 x 16 9 x 9 64 x 64 1 ( x 1)
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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.
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C©u 4: T×m sè nghÞch ®¶o cña 2013 2014 (1®)
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®¸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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