Question

（x的平方-y的平方）分之2xy+（x+y)分之x

Answer 1

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)