Kiem tra 15

ĐỀ 1:
1. Khai triển các lũy thừa:
a) (x – y)2 = ....................................................................................................................................
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b) (m – 2n)3 = .................................................................................................................................
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2. Phân tích đa thức thành nhân tử:
a) 5x – 10x2 = ...................................................................................................................................
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b) 5x2 – 10xy + 5y2 – 20t2 = ............................................................................................................
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3. Tìm x, biết :
4x2 – 81 = 0
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4. Viết công thức 7 hằng đẳng thức đáng nhớ
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ĐỀ 2:
1. Khai triển các lũy thừa:

a) (2x + y)2 = ..................................................................................................................................
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b) (m – n)3 = ...................................................................................................................................
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2. Phân tích đa thức thành nhân tử:
a) 4x2 – 8x = .....................................................................................................................................
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b) 3x2 + 6xy + 3y2 – 27t2 = ..............................................................................................................
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3. Tìm x, biết :
9x2 – 16 = 0
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4. Viết cơng thức 7 hằng đẳng thức đáng nhớ?
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ĐỀ 3:
I. Phần trắc nghiệm: (4,5 điểm)
Câu 1: (x – y)2 bằng:
A. x2 + y2
B. (y – x)2

C. y2 – x2
2
Câu 2: (x + y) bằng:
A. x2 + 2xy + y2
B. 4x2 – 4
C. 16x2 + 4
Câu 3: x2 – y2
A. (x + y )(x + y )
B. (x + y )(x – y )
C. (x - y )(x- y)
Câu 4/ Điền chữ Đ (đúng) hoặc S (sai) vào mỗi ô vuông:
a) (a + b)3 = a3 + b3
ƒ
b) -3x + 6 = -3(x - 2)
ƒ
c) (x – y)3 = (y – x)3
ƒ
II. Phần tự luận: (5.5 điểm)
Câu 5 (2,5 điểm) Phân tích các đa thức sau thành nhân tử:
a) x3 + 2x2 + x
b) xy + y2 – x – y
Câu 6 (1,5 điểm) Tìm x, biết: 3x(x2 – 4) = 0
Câu 7 (1,5 điểm) Tính giá trị của đa thức:
P = x2 – xy + x - y tại
x=6;y=-4.
ĐỀ 4:

D. x2 – y2
D. 16x2 – 4
D. 0

1. Khai triển các lũy thừa:
a) (3x – 4y)2 =
………………………………………………………………………………………………..


b) (m – n)8 =
………………………………………………………………………………………………….
2. Phân tích đa thức thành nhân tử:
a) 10xy – 5x2y =
………………………………………………………………………………………………
b) 12x + 20x2 – 2 xy =
………………………………………………………………………………………..
3. Tìm x biết : 9x2 – 64 = 0
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ĐỀ 5:
1. Khai triển các biểu thức sau:

a) (2x - y)2 = ...................................................................................................................................
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b) m3 – n3 = .....................................................................................................................................
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2. Phân tích đa thức thành nhân tử:
a) 8z – 4z2 = .....................................................................................................................................
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b) 3y2 + 6yz + 3z2 – 12t2 = ...............................................................................................................

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3. Tìm x, biết :
4x2 – 16 = 0
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4. Viết công thức 6 hằng đẳng thức đáng nhớ?
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ĐỀ 6:
1. Khai triển các biểu thức sau:

a) (x - y)3 = .....................................................................................................................................
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b) m2 - n2 = .....................................................................................................................................
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2. Phân tích đa thức thành nhân tử:
a) 9x2 + 15x = ..................................................................................................................................
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b) 5z2 - 10yz + 5y2 – 5x2 = ...............................................................................................................
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3. Tìm z, biết :
z2 – 49 = 0
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4. Viết công thức 6 hằng đẳng thức đáng nhớ?
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