(1)x²-1/x²+4x+4÷(x+1)乘x+2/1-x

问题描述:

(1)x²-1/x²+4x+4÷(x+1)乘x+2/1-x
(3)(2xy分之-mn)²÷8x²/y²乘(-2m分之y²)³(2)(xy-x²)÷x²-2xy+y²/xy乘x-y/x²

(1)(x²-1)/(x²+4x+4)÷(x+1)*(x+2)/(1-x)=(x+1)(x-1)/(x+2)²*1/(x+1)*(x+2)/(1-x)=-1/(x+2)(2)(xy-x²)÷(x²-2xy+y²)/xy*(x-y)/x²=-x(x-y)÷(x-y)²/xy*(x-y)/x²...