计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?

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计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
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计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?

计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
=2x/(x-2)(x+1)×(x+1)/(1-x)-x(x+2)/(x+2)(x-2)
=2x/(x-2)(1-x)-x/(x-2)
=x/(x-2)×((2-1+x)/(1-x))
=x(x+1)/(x-2)(1-x);
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