数学用乘法公式计算
(x+y+1)(x+y-1)
(2x-y-3)²
人气：279 ℃ 时间：2019-12-01 11:17:21
解答
(x+y+1)(x+y-1)
=(x+y)²-1
=x²+2xy+y²-1
(2x-y-3)²
=(2x-y)²-2(2x-y)+3
=4x²+4xy+y²-4x+2y+9
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