Tài liệu Kiểm tra 1 tiết đại số 8 (4)

Tröôøng: THCS Caùi Daàu Lôùp: Hoï vaø teân: Ñieåm: KIEÅM TRA 1 TIEÁT Moân: ÑAÏI SOÁ 8 Ngaøy: Lôøi pheâ giaùo vieân: ÑEÀB: I/ PHAÀN TRAÉC NGHIEÄM:(3ñ ) Khoanh troøn chæ moät chöõ caùi in hoa ñöùng tröôùc caâu traû lôøi ñuùng Caâu 1 : Keát quaû ruùt goïn cuûa bieåu thöùc (2x + y )2 – (2x – y )2 laø: A. 2y2 B. 4xy C.4x2 D. 8xy Caâu 2: Tìm x bieát 2x2 = 6x A. x = 0 B. x = 3 C. x = 0; x = 3 D. x = - 3 Caâu 3: Keát quaû cuûa pheùp tính (- x) 6 : x2 baèng A.-x 3 B. x 3 C. x 4 D. - x 4 II/ PHAÀN TÖÏ LUAÄN (7ñ ) Caâu 1: Thöïc hieän pheùp tính (2ñ ) x x2 + 1 2x – 2 2 – 2x2 Caâu 2: Cho bieåu thöùc: (3ñ ) M = ( 10 x 2  5x 4 x 2  1 : )+3 2x  6 3 x a) Ruùt goïn M b) Tìm ñieàu kieän xaùc ñònh cuûa M Caâu 3: Thöïc hieän pheùp tính (2ñ ) 3x  6 x 2  1 . x4  1 2  x BAØI LAØM: ............................................................................................................................................................ 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