乘法公式运算:(x+y+1)(x+y-1)

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乘法公式运算:(x+y+1)(x+y-1)乘法公式运算:(x+y+1)(x+y-1)乘法公式运算:(x+y+1)(x+y-1)(x+y+1)(x+y-1)=(x+y)²-1=x²+

乘法公式运算:(x+y+1)(x+y-1)
乘法公式运算:(x+y+1)(x+y-1)

乘法公式运算:(x+y+1)(x+y-1)
(x+y+1)(x+y-1)
=(x+y)²-1
=x²+2xy+y²-1

(x+y+1)(x+y-1)=(x+y)^2-1=x^2+2xy+y^2-1

啥意思?