Question

分式的计算题请写出过程,

Answer 1

解原式=(x-y)/(x+y)+(x-y)(x+y)/(x+y)²-2=(x-y)/(x+y)+(x-y)/(x+y)-2=(x-y+x-y)/(x+y)-2=(2x-2y)/(x+y)-2(x+y)/(x+y)=-4y/(x+y)