【(x²-4/x²-4x+4)+(2-x/x+2)】÷(x/x-2)等于多少?
问题描述:
【(x²-4/x²-4x+4)+(2-x/x+2)】÷(x/x-2)等于多少?
答
【(x²-4/x²-4x+4)+(2-x/x+2)】÷(x/x-2)=[(x+2)(x-2)/(x-2)^2+(2-x)/(x+2)]÷(x/x-2)=[(x+2)/(x-2)+(2-x)/(x+2)]÷(x/x-2)=[(x^2+4x+4-x^2+4x-4)/(x-2)(x+2)]÷(x/x-2)=[8x/(x-2)(x+2)]x[(x-2)/x]=8/(x+2...