运用平方差计算..(-x+y)(-x-y)(-x+y)(x+y)

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运用平方差计算..(-x+y)(-x-y)(-x+y)(x+y)

运用平方差计算..(-x+y)(-x-y)(-x+y)(x+y)
运用平方差计算..
(-x+y)(-x-y)
(-x+y)(x+y)

运用平方差计算..(-x+y)(-x-y)(-x+y)(x+y)
这是要干啥?
=x^2-y^2
=y^2-x^2

(-x+y)(-x-y)=(-x)²-y²=x²-y²
(-x+y)(x+y)=y²-x²