(x的4次方-y的4次方)除以(x方+y方)/(x+y)乘以1/(x+y)的平方

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(x的4次方-y的4次方)除以(x方+y方)/(x+y)乘以1/(x+y)的平方
(x的4次方-y的4次方)除以(x方+y方)/(x+y)乘以1/(x+y)的平方

(x的4次方-y的4次方)除以(x方+y方)/(x+y)乘以1/(x+y)的平方
原式=(x²+y²)(x²-y²)×(x+y)/(x²+y²)×1/(x+y)²
=(x²-y²)/(x+y)
=x-y