(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)

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(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平

(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)
(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)

(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)
=(x-y)[(x+y)²-(x²+y²)]
=(x-y)(x²+2xy+y²-x²-y²)
=2xy(x-y)

(x+y)²(x-y)-(x-y)(x²+y²)
=[(x+y)²-(x²+y²)](x-y)
=(x²+2xy+y²-x²-y²)(x-y)
=2xy(x-y)

2xy乘以(x-y)