(x的平方-y的平方)分之2xy+(x+y)分之x

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(x的平方-y的平方)分之2xy+(x+y)分之x

(x的平方-y的平方)分之2xy+(x+y)分之x
(x的平方-y的平方)分之2xy+(x+y)分之x

(x的平方-y的平方)分之2xy+(x+y)分之x
原式=2xy/(x+y)(x-y)+x(x-y)/(x+y)(x-y)
=(2xy+x²-xy)/(x+y)(x-y)
=(x²+xy)/(x+y)(x-y)
=x(x+y)/(x+y)(x-y)
=x/(x-y)