KT 15 ph ĐS 8 (4 Đề)
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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 2x
2
(x
2
– x +2) bằng :
a) 2x
4
+ 2x
3
– 2x
2
b) 2x
4
- 2x
3
– 2x
2
c)2x
4
- 2x
3
– 4x
2
d) 2x
4
- 2x
3
+ 4x
2
2) Kết quả (x
2
-1) (x
2
+3) bằng :
a) x
4
+ 4x
2
+3 b) x
4
+ 2x
2
- 3 c) x
4
- 2x
2
- 3 d) x
4
- 4x
2
+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) A
2
- 2AB + B
2
2) A
3
– B
3
b)A
3
- 3A
2
B +3AB
2
- B
3
3) (A- B)
3
c) (A+B) ( A
2
- AB + B
2
)
4) A
2
– B
2
d) (A+B) (A- B)
e) A
2
+ 2AB + B
2
g) A
3
+ 3A
2
B +3AB
2
+ B
3
h) (A- B) ( A
2
+ AB + B
2
)
B/ Tự luận : ( 7 đ)
1) Phân tích đa thức sau thành nhân tử
a) 4x
2
- 2xy (1 đ) b) 4 x
2
- 12x +9 (2 đ)
2) Tính nhanh 65
2
– 35
2
( 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 2x
2
(x
2
– x -1) bằng :
a) 2x
4
+ 2x
3
– 2x
2
b) 2x
4
- 2x
3
– 2x
2
c)2x
4
- 2x
3
– 4x
2
d) 2x
4
- 2x
3
+ 4x
2
2) Kết quả (x
2
+1) (x
2
+3) bằng :
a) x
4
+ 4x
2
+3 b) x
4
+ 2x
2
- 3 c) x
4
- 2x
2
- 3 d) x
4
- 4x
2
+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) A
2
- 2AB + B
2
2) A
2
– B
2
b)A
3
- 3A
2
B +3AB
2
- B
3
3) (A+ B)
2
c) (A+B) ( A
2
- AB + B
2
)
4) A
3
– B
3
d) (A+B) (A- B)
e) A
2
+ 2AB + B
2
g) A
3
+ 3A
2
B +3AB
2
+ B
3
h) (A- B) ( A
2
+ AB + B
2
)
B/ Tự luận : ( 7 đ)
1)Phân tích đa thức sau thành nhân tử
a) 4x
2
y - 8x
2
(1 đ) b) 2 x
2
- 8x + 8 (2 đ)
2) Tính nhanh 55
2
+ 110. 45 + 45
2
( 2 đ)
3) Tìm n , biết n
3
+ 4n
2
+ 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)
2) Kết quả 2x
2
(x
2
+ x -1) bằng :
a) 2x
4
+ 2x
3
– 2x
2
b) 2x
4
- 2x
3
– 2x
2
c)2x
4
- 2x
3
– 4x
2
d) 2x
4
- 2x
3
+ 4x
2
2) Kết quả (x
2
-1) (x
2
-3) bằng :
a) x
4
+ 4x
2
+3 b) x
4
+ 2x
2
- 3 c) x
4
- 2x
2
- 3 d) x
4
- 4x
2
+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
2
– B
2
a) A
2
- 2AB + B
2
2) (A- B)
2
b)A
3
- 3A
2
B +3AB
2
- B
3
3) A
3
+ B
3
c) (A+B) ( A
2
- AB + B
2
)
4) (A+ B)
3
d) (A+B) (A- B)
e) A
2
+ 2AB + B
2
g) A
3
+ 3A
2
B +3AB
2
+ B
3
h) (A- B) ( A
2
+ AB + B
2
)
B/ Tự luận : ( 7 đ)
2) Phân tích đa thức sau thành nhân tử
a) 2x + 4x
2
y (1 đ) b) 8 x
2
- 50 (2 đ)
2) Tính nhanh 101
2
( 2 đ)
3) Tìm n , biết n
3
– 4n
2
= 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 2x
2
(x
2
– x - 2) bằng :
a) 2x
4
+ 2x
3
– 2x
2
b) 2x
4
- 2x
3
– 2x
2
c)2x
4
- 2x
3
– 4x
2
d) 2x
4
- 2x
3
+ 4x
2
2) Kết quả (x
2
+ 1) (x
2
- 3) bằng :
a) x
4
+ 4x
2
+3 b) x
4
+ 2x
2
- 3 c) x
4
- 2x
2
- 3 d) x
4
- 4x
2
+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) A
2
- 2AB + B
2
2) A
3
+ B
3
b)A
3
- 3A
2
B +3AB
2
- B
3
3) A
2
– B
2
c) (A+B) ( A
2
- AB + B
2
)
4) (A- B)
3
d) (A+B) (A- B)
e) A
2
+ 2AB + B
2
g) A
3
+ 3A
2
B +3AB
2
+ B
3
h) (A- B) ( A
2
+ AB + B
2
)
B/ Tự luận : ( 7 đ)
3) Phân tích đa thức sau thành nhân tử
a) 2x
2
y
2
+ xy
3
(1 đ) b) 8 x
3
+ y
3
(2 đ)
2) Tính nhanh 135
2
– 270 . 35 + 35
2
( 2 đ)
3) Tìm n , biết 12 n – 4n
2
- 9 = 0 ( 2 đ)
BÀI GIẢI
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