Bài kiểm tra viết số 1 môn: Đại số trường PTDT Nội Trú - Bá thước

Tr­êng PTDT Néi Tró - B¸ Th­íc Ngµy th¸ng 11 n¨m 2006 Hä vµ tªn: ................................................ Bµi kiÓm tra viÕt sè 1 Líp: 8…. M«n: §¹i sè – (thêigian: 45’) §iÓm NhËn xÐt cña thÇy gi¸o Bµi lµm: H·y khoanh trßn vµo ch÷ c¸i ®øng ®Çu c©u tr¶ lêi ®óng tõ c©u 1 ®Õn c©u 4. C©u 1: (0,5®) KÕt qu¶ cña phÐp tÝnh -2x(3x2 + 4x -1) lµ: A. 6x3 + 8 x2 + 2x B. - 6x3 + 8 x2 - 2x C. 6x3 - 8 x2 - 2x D. - 6x3 - 8 x2 + 2x C©u 2: (0,5®) KÕt qu¶ cña phÐp tÝnh (x2 - 2x +1)(x - 1) lµ: A. x3 - 3x2 +3x - 1 B. x3 - 3x2 +3x + 1 C. x3 - 3x2 -3x + 1 D. x3 - 3x2 - 3x - 1 C©u 3: (0,5®) BiÕt 4x(x - 1) - 3(x2 - 5) - x2 = 27 . Gi¸ trÞ cña x lµ: A. 2 B. 3 C. 4 D. 5 C©u 4: (0,5®) NÕu a lµ mét h»ng sè (x - 2)(x + 3) = x2 + ax - 6 th× a b»ng: A. -5 B. 1 C. -1 D. 5 C©u 5: (2,0 ®) §iÒn dÊu “X” vµo « thÝch hîp. C©u Néi dung §óng Sai 1 (x - 2)2 = x2 - 2x + 4 2 (x- y)2 = x2 - y2 3 - (x + 3)3 = (-x - 3)3 4 (x3 - 8) : (x - 2) = x2 + 2x + 4 C©u 6: (1, 0®) Rót gän råi tÝnh gi¸ trÞ cña biÓu thøc sau t¹i x = 2; y = -3 M = 3(x - y)2 - 2(x + y)2 - (x - y)(x + y) …………………………………………………………………………………………. …………………………………………………………………………………………. C©u 7: (2,0®) T×m x biÕt: a) x2 - 49 = 0 b) x2 + x - 6 = 0 …………………………………………………………………………………………. …………………………………………………………………………………………. ………………………………………………………………………………………….…………………………………………………………………………………………. C©u 8: ( 1,0®) Ph©n tÝch ®a thøc thµnh nh©n tö: y2(x - 1) - 7y3 + 7xy3 …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. C©u 9: (1,0®) Lµm tÝnh chia: (x4 - 2x3 + 2x - 1) : (x2 - 1) …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. C©u 10: (1, 0®) T×m nÎZ ®Ó 2n2 + 5n - 1 chia hÕt cho 2n - 1 …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ………………………………………………………………………………………….………………………………………………………………………………………….