Question

分式计算步骤写清楚（1） x²-2xy+y² （2）x²-y² 4x（x-y）+

Answer 1

(1).原式=x(y-x)×xy/(x-y)²=x²y/(y-x)

(2).原式=(x-y)-(2x-y)²/(2x-y)=-x

(3).原式=a+2+4/(a-2)=(a²-4+4)/(a-2)=a²/(a-2)

(4).原式=(x²-4-x²+x)/【x(x-2)²】×【x/(4-x)】=(-1)/(x-2)²

(5).原式=【(a²+a)/(a-1)】×【(a-1)/(a²-2a)】=(a+1)/(a-2)