De kiem tra chuong I dai so 8
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<span class='text_page_counter'>(1)</span>Họ tên : ........................................................... Lớp: 8 KIỂM TRA CHƯƠNG I(1 TIẾT). Môn: Toán 8(đại số) Điểm. Lời phê của cô giáo. đề bài. A. Tr¾c nghi Öm kh¸ch quan (2 ®iÓm) Câu 1: Điền đúng (Đ) hoặc sai (S) vào ô trống: a) (x-2)2 = x2 - 2x +4 b) -(x-5)3 = (-x+5)3 c) x2 -16 = (x-4)2 d) (x+3)3 = x3 +9x2 +27x+ 27 * C©u 2 : BiÓu thøc x2- 4y2 ph©n tÝch thµnh: A. (x+4y)(x-4y) B. (x-2y)2 C. (x+2y)(x-2y) * C©u 3 BiÓu thøc A = x2-6x+9 cã gi¸ trÞ t¹i x=9 lµ: A. 0 B. 36 C. 18 D. 81 B. Tù luËn C©u 1: (2 ®iÓm) Ph©n tÝch ®a thøc thµnh nh©n tö: a) 5x3y3 - 10x3y b) x2 9 - x + 3 d) 5x-5y -x2 +2xy - y2. D. (x-4y)2. c) x2+3x+2. 1 1 P x 2 x 2 16 C©u 2: (1 ®iÓm) Cho. a) Rót gän P b) TÝnh gi¸ trÞ cña P t¹i x = 49.75 C©u 3:(2đ) Rót gän biÓu thøc sau: a) ( x 2 −1 ) ( x +2 ) − ( x − 2 ) ( x 2 +2 x+ 4 ) b) (3x 1)2 + 2(3x 1) (2x + 1) + (2x + 1)2 Câu 4: (2đ) Tìm a để giá trị của đa thức f(x) = 4 x 3 +7 x 2 − 9 x+ a chia hết cho đa thức g(x) = x + 3. C©u 5: (1đ) T×m GTNN cña biÓu thøc A = 4x2 + 10x - 3 Bài làm ............................................................................................................................................................. ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ......................................................................................................................................................................
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<span class='text_page_counter'>(4)</span> ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ...................................... . A. Tr¾c nghi Öm kh¸ch quan C©u 1: (2 ®iÓm). * Điền đúng (Đ) hoặc sai (S) vào ô trống: a) (x-2)2 = x2 - 2x +4 b) -(x-5)3 = (-x+5)3 c) x2 -16 = (x-4)2 d) (x+3)3 = x3 +9x2 +27x+ 27 * BiÓu thøc x2- 4y2 ph©n tÝch thµnh:.
<span class='text_page_counter'>(5)</span> A. (x+4y)(x-4y) B. (x-2y)2 C. (x+2y)(x-2y) D. (x-4y)2 * BiÓu thøc A = x2-6x+9 cã gi¸ trÞ t¹i x=9 lµ: A. 0 B. 36 C. 18 D. 81 B. Tù luËn C©u 1: (3 ®iÓm) Ph©n tÝch ®a thøc thµnh nh©n tö:. a) 5x3y3 - 10x3y b) 5x-5y +x2 -2xy +y2 c) x2+3x+2 1 1 P x 2 x 2 16 C©u 2: (1 ®iÓm) Cho. a) Rót gän P b) TÝnh gi¸ trÞ cña P t¹i x = 49.75 C©u 3:(1đ) Rót gän biÓu thøc sau: ( x 2 −1 ) ( x +2 ) − ( x − 2 ) ( x 2 +2 x+ 4 ) Câu 4: (2đ) Tìm a để giá trị của đa thức f(x) = 4 x 3 +7 x 2 − 9 x+ a chia hết cho đa thức g(x) = x + 3. C©u 5: (1đ) T×m GTNN cña biÓu thøc A = 4x2 + 10x - 3 Bài làm ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... ..................................................................................................................................................................... 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