DE TOAN KSCL LOP 8

ĐỀ THI KHẢO SÁT CHẤT LƯNG ĐẦU NĂM MÔN: TOÁN; Đề: chẳn ; Lớp 8; Ngày thi : 16/09/2006 Thời gian làm bài : 60 phút ( Không kể thời gian phát đề ) Trường THCS Nguyễn Bỉnh Khiêm Lớp :…. Họ tên thí sinh :……………… ……… Lời phê của GV : ĐIỂM I.Trắc nghiệm: (4đ) Câu 1: Đánh dấu “X” vào ô mà em chọn (1 điểm ) Câu Nội dung Đ S 1 3x 2 (2x 3 – 5x) = 6x 5 – 15 x 3 2 (5x 4 – 2x 3 + 2)x = 5x 4 – 2x + 2 3 (5xy – x 2 + y). 5 2 = 2xy - 5 2 x 2 + 5 2 y 4 4x 2 y .( 2x 2 y 2 – 3xy) = 8xy – 12x 3 y 2 Bài 2 : Điền vào chổ trống (1 đ) 1 / Muốn nhân một đa thức với 1 đa thức . của đa thức kia 2/ Hình thang cân là Bài 3 : Khoanh tròn vào câu trả lời đúng (2đ). Câu 1 :Tổng các góc của một tứ giác bằng . a/ 630 o b/ 360 o c/ 180 o d/ 306 o Câu 2 : Cho tứ giác ABCD có góc C = 100 o ; góc B = 70 o ; góc A = 130 o thì a/ góc D = 90 o ; b/ góc D = 60 o ; c/ góc D = 50 o ; d/ góc D = 70 o Câu 3 : Cho hình thang ABCD (AB // CD) có . Góc A = 120 0 thì a/ góc D = 60 o ; b/ góc D = 50 o ; c/ góc D = 70 o ; d/ góc D = 40 o Câu 4 : (5x 3 – 4xy + x)(- 5 1 xy) = a/ xy 4 - 5 4 x 2 y 2 + 5 1 x 2 y b/ x 4 y + 5x 2 y 2 + x 2 y c/ x 4 y - 4x 2 y + 5x 2 y d/ - x 4 y + 5 4 x 2 y 2 - 5 1 x 2 y II/ Tự luận (6 đ) A/ Đại số (3đ) Bài 1 : Rút gọn rồi tính giá trò biểu thức (2 đ) A = (x 2 – 8 ) x + 2 – x 3 tại x = - 1 B = (x 2 + 1 ) (x - 3y + 2) – x (x 2 - 3xy + 2x ) tại x=2 ; y=-1 Bài 2 : Tìm x biết ( 1đ ) 5x ( 4x – 3 ) -2x ( 10x – 5 ) = 30 B/ Hình học : ( 3đ ) Bài 3 : Cho tứ giác ABCD biết rằng góc ^ A = 130 0 ; góc ^ D = 50 0 a. Chứng minh tứ giác ABCD là hình thang . b. Tính các góc ^ B và góc ^ C biết góc ^ B = 2 ^ C c. Gọi BE là tia phân giác của ^ ABC . Chứng minh  BEC đều . 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------------------------------------------------------------------------------------------------------- [...]... - ĐỀ THI KHẢO SÁT CHẤT LƯNG ĐẦU NĂM MÔN: TOÁN; Đề: lẽ ; Lớp 8; Ngày thi : 16/09/2006 Thời gian làm bài : 60 phút ( Không kể thời gian phát đề ) Trường THCS Nguyễn Bỉnh Khiêm Lời phê của GV : ĐIỂM Lớp :… Họ tên thí sinh :……………… ……… I.Trắc nghiệm: (4đ) Câu 1: Đánh... của đa thức 2/ Tứ giác lồi là bất kỳ cạnh nào Bài 3 : Khoanh tròn vào câu trả lời đúng (2đ) Câu 1 :Tổng các góc của một tứ giác bằng a/ 630o b/ 360o c/ 306o d/ 180 o Câu 2 : Cho tứ giác ABCD có góc A = 130o ; góc B = 70o ; góc C = 100o thì a/ góc D = 50o ; b/ góc D = 70o ; c/ góc D = 60o ; d/ góc D = 90o Câu 3 : Cho hình thang ABCD (AB // CD) có Góc A = 1300 thì... 3 + 2 x2y2 - x2y 3 2 1 2 5 3 xy) = a/ - 2x4y + b/ 2x3y - c/ - 2x 3y2 d/ 2x5y + 3 2 3 2 xy + x2y x2y2 - x2y II/ Tự luận (6 đ) A/ Đại số (3đ) Bài 1 : Rút gọn rồi tính giá trò biểu thức (2 đ) A = x(x3 – 8 ) +4 – x4 tại x = 1 B = (x - 2 ) (x 2 -xy ) – x 2 (x - xy - 2 ) tại x = -1 ; y = 2 Bài 2 : Tìm x biết ( 1đ ) 6x ( x – 5 ) + 3x ( 7 – 2x ) = 27 B/ Hình học : ( 3đ ) Bài 3 : Cho tứ giác ABCD biết rằng . ĐỀ THI KHẢO SÁT CHẤT LƯNG ĐẦU NĂM MÔN: TOÁN; Đề: chẳn ; Lớp 8; Ngày thi : 16/09/2006 Thời gian làm bài : 60 phút ( Không kể thời gian phát. (5xy – x 2 + y). 5 2 = 2xy - 5 2 x 2 + 5 2 y 4 4x 2 y .( 2x 2 y 2 – 3xy) = 8xy – 12x 3 y 2 Bài 2 : Điền vào chổ trống (1 đ) 1 / Muốn nhân một đa thức với