Kiểm tra 15 phút môn Đại số 8 (bài 1)

Họ,tên:. KIỂM TRA 15 PHÚT
Học lớp:.. Môn Đại Số 8 (Bài 1)
A/ Trắc nghiệm: (3 đ)
Kết quả 2x2 (x2 – x +2) bằng :
 a) 2x4 + 2x3 – 2x2 b) 2x4 - 2x3 – 2x2 c)2x4 - 2x3 – 4x2 d) 2x4 - 2x3 + 4x2
 2) Kết quả (x2-1) (x2 +3) bằng :
 a) x4 + 4x2 +3 b) x4 + 2x2 - 3 c) x4 - 2x2 - 3 d) x4 - 4x2 +3
 3) Nối biểu thức ở cột A với biểu thức ở cột B để được một hằng đẳng thức đúng.
A
 KẾT QUẢ NỐI
 1) = .
 2) = .
 3) = .
 4) = .
B
1) (A+B)2
a) A2 - 2AB + B2
2) A3 – B3
b)A3 - 3A2 B +3AB2 - B3
3) (A- B)3
c) (A+B) ( A2 - AB + B2 )
4) A2 – B2
d) (A+B) (A- B)
e) A2 + 2AB + B2
g) A3 + 3A2 B +3AB2 + B3
h) (A- B) ( A2 + AB + B2 )
 B/ Tự luận : ( 7 đ)
Phân tích đa thức sau thành nhân tử 
a) 4x2 - 2xy (1 đ) b) 4 x2 - 12x +9 (2 đ)
 2) Tính nhanh 652 – 352 ( 2 đ)
 3) Tìm n , biết 2n(n-1)+4(n-1) = 0 ( 2 đ)
 BÀI GIẢI
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Họ,tên:. KIỂM TRA 15 PHÚT
Học lớp:.. Môn Đại Số 8 (Bài 1)
A/ Trắc nghiệm: (3 đ)
1)Kết quả 2x2 (x2 – x -1) bằng :
 a) 2x4 + 2x3 – 2x2 b) 2x4 - 2x3 – 2x2 c)2x4 - 2x3 – 4x2 d) 2x4 - 2x3 + 4x2
 2) Kết quả (x2 +1) (x2 +3) bằng :
 a) x4 + 4x2 +3 b) x4 + 2x2 - 3 c) x4 - 2x2 - 3 d) x4 - 4x2 +3
 3) Nối biểu thức ở cột A với biểu thức ở cột B để được một hằng đẳng thức đúng.
A
 KẾT QUẢ NỐI
 1) = .
 2) = .
 3) = .
 4) = .
B
1) (A - B)3
a) A2 - 2AB + B2
2) A2 – B2
b)A3 - 3A2 B +3AB2 - B3
3) (A+ B)2
c) (A+B) ( A2 - AB + B2 )
4) A3 – B3
d) (A+B) (A- B)
e) A2 + 2AB + B2
g) A3 + 3A2 B +3AB2 + B3
h) (A- B) ( A2 + AB + B2 )
 B/ Tự luận : ( 7 đ)
1)Phân tích đa thức sau thành nhân tử 
a) 4x2y - 8x2 (1 đ) b) 2 x2 - 8x + 8 (2 đ)
 2) Tính nhanh 552 + 110. 45 + 452 ( 2 đ)
 3) Tìm n , biết n3 + 4n2 + 4n = 0 ( 2 đ)
 BÀI GIẢI
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Họ,tên:. KIỂM TRA 15 PHÚT
Học lớp:.. Môn Đại Số 8 (Bài 1)
A/ Trắc nghiệm: (3 đ)
Kết quả 2x2 (x2 + x -1) bằng :
 a) 2x4 + 2x3 – 2x2 b) 2x4 - 2x3 – 2x2 c)2x4 - 2x3 – 4x2 d) 2x4 - 2x3 + 4x2
 2) Kết quả (x2-1) (x2 -3) bằng :
 a) x4 + 4x2 +3 b) x4 + 2x2 - 3 c) x4 - 2x2 - 3 d) x4 - 4x2 +3
 3) Nối biểu thức ở cột A với biểu thức ở cột B để được một hằng đẳng thức đúng.
A
 KẾT QUẢ NỐI
 1) = .
 2) = .
 3) = .
 4) = .
B
1) A2 – B2
a) A2 - 2AB + B2
2) (A- B)2
b)A3 - 3A2 B +3AB2 - B3
3) A3 + B3 
c) (A+B) ( A2 - AB + B2 )
4) (A+ B)3
d) (A+B) (A- B)
e) A2 + 2AB + B2
g) A3 + 3A2 B +3AB2 + B3
h) (A- B) ( A2 + AB + B2 )
 B/ Tự luận : ( 7 đ)
Phân tích đa thức sau thành nhân tử 
a) 2x + 4x2y (1 đ) b) 8 x2 - 50 (2 đ)
 2) Tính nhanh 1012 ( 2 đ)
 3) Tìm n , biết n3 – 4n2 = 0 ( 2 đ)
 BÀI GIẢI
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Họ,tên:. KIỂM TRA 15 PHÚT
Học lớp:.. Môn Đại Số 8 (Bài 1)
A/ Trắc nghiệm: (3 đ)
1)Kết quả 2x2 (x2 – x - 2) bằng :
 a) 2x4 + 2x3 – 2x2 b) 2x4 - 2x3 – 2x2 c)2x4 - 2x3 – 4x2 d) 2x4 - 2x3 + 4x2
 2) Kết quả (x2 + 1) (x2 - 3) bằng :
 a) x4 + 4x2 +3 b) x4 + 2x2 - 3 c) x4 - 2x2 - 3 d) x4 - 4x2 +3
 3) Nối biểu thức ở cột A với biểu thức ở cột B để được một hằng đẳng thức đúng.
A
 KẾT QUẢ NỐI
 1) = .
 2) = .
 3) = .
 4) = .
B
1) (A - B)2
a) A2 - 2AB + B2
2) A3 + B3
b)A3 - 3A2 B +3AB2 - B3
3) A2 – B2
c) (A+B) ( A2 - AB + B2 )
4) (A- B)3 
d) (A+B) (A- B)
e) A2 + 2AB + B2
g) A3 + 3A2 B +3AB2 + B3
h) (A- B) ( A2 + AB + B2 )
 B/ Tự luận : ( 7 đ)
Phân tích đa thức sau thành nhân tử 
a) 2x2 y2 + xy3 (1 đ) b) 8 x3 + y3 (2 đ)
 2) Tính nhanh 1352 – 270 . 35 + 352 ( 2 đ)
 3) Tìm n , biết 12 n – 4n2 - 9 = 0 ( 2 đ)
 BÀI GIẢI
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