配套习题- 平方差公式 -【青果学院】

1/5单选题

难度：

1.利用平方差公式计算(2a-5)(-2a-5)的结果是( )

A	4a²-5
B	4a²-25
C	25-4a²
D	4a²+25

正确答案：Qw==

6Kej562U77yaKDJhLTUpKC0yYS01KT0gKC01KzJhKSgtNS0yYSk9IDI1LTQ8aW1nIHdpZHRoPTE5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzczLzFCL3JCQUNFMVRJbFF1REY2SHZBQUFCWWtJVWxSRTk2NS5wbmciPjxicj7mlYXpgIlD

2/5单选题

难度：

2.计算

的结果是( )

A	18x²-2
B	2-18x²
C	0
D	8x²

正确答案：Qw==

6Kej562U77yaPGJyPjxpbWcgd2lkdGg9MTg4IGhlaWdodD00MCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzczLzFCL3JCQUNFMVRJbFJXUzlqbGJBQUFFeVFlMkE5azQwMi5wbmciPj08aW1nIHdpZHRoPTE4MyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9BQS8yMi9yQkFDRkZUSWxSV0E1X2NUQUFBRFBpQ0xlT0UxNTAucG5nIj49PGltZyB3aWR0aD0xMzcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvQTcvckJBQ0psVElsUldqTUh6LUFBQUNObEczbFVRNTc0LnBuZyI+PTDmlYXpgIlD

3/5单选题

难度：

3.若x²-y²=3，则(x+y)²·(x-y)²的值是( )

A	3
B	6
C	9
D	18

正确答案：Qw==

6Kej562U77ya4oi1KHgreSk8c3VwPjI8L3N1cD7CtzxpbWcgd2lkdGg9MjM1IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0U1L3JCQUNKMVRJbFJpZzNHdTVBQUFEWmk2VnVxUTgzMy5wbmciPj08aW1nIHdpZHRoPTc3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNFL0U1L3JCQUNKMVRJbFJqUkNfUEpBQUFDUEg5ZU5idzI1NS5wbmciPjxicj7iiLV4PHN1cD4yPC9zdXA+LXk8c3VwPjI8L3N1cD49Mzxicj7iiLTljp/lvI/nmoTlgLzkuLo5PGJyPuaVhemAiUM=

4/5单选题

难度：

4.下列各式变形后不能用平方差公式计算的是( )

A	(x-2y)(2y+x)
B	(2-4y)(4y+2)
C	(-2y-x)(x+2y)
D	(-2b-5)(2b-5)

正确答案：Qw==

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

5/5单选题

难度：

5.(a+b-c)(a-b+c)等于 ( )

A	a²-(b-c)²
B	a²+(b+c)²
C	(a-b)²-c²
D	(a+b)²-c²

正确答案：QQ==

6Kej562U77ya4oi1KGErYi1jKShhLWIrYyk9PGltZyB3aWR0aD0yMDcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQUEvMjIvckJBQ0ZGVElsUkt3YkRJX0FBQURIbmh6TEM4NTg2LnBuZyI+PSBhPHN1cD4yPC9zdXA+LShiLWMpPHN1cD4yPC9zdXA+IDxicj7mlYXpgIlB