x-y分之2减去(x-y)的平方分之x+y 分式加减咋做啊?

问题描述:

x-y分之2减去(x-y)的平方分之x+y 分式加减咋做啊?

53

2/(x-y)-(x+y)/(x-y)^2=[(2x-2y)-(x+y)]/(x-y)^2=(x-3y)/(x-y)^2