问题描述:
(x+y)²-4(x+y-1)
(x²+y²)²-4x²y²
(x²+2x)²+2(x²+2x)+1
a²-b²-2a+1
9-6a-6b+a²+2ab+b²
(x²+y²)²-4x²y²
(x²+2x)²+2(x²+2x)+1
a²-b²-2a+1
9-6a-6b+a²+2ab+b²
问题解答:
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