化简:2/(x+1)-(x-2)/(x²-1)÷(x²-2x)/(x²-2x+1)
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化简:2/(x+1)-(x-2)/(x²-1)÷(x²-2x)/(x²-2x+1)
化简:2/(x+1)-(x-2)/(x²-1)÷(x²-2x)/(x²-2x+1)
化简:2/(x+1)-(x-2)/(x²-1)÷(x²-2x)/(x²-2x+1)
=2/(x+1)-(x-2)/(x+1)(x-1)÷x(x-2)/(x-1)(x-1)
=2/(x-1)-(x-2)/(x+1)(x-1)乘(x-1)(x-1)/(x-2)x
然后约分
=2/(x+1)-(x-1)/x(x+1)
然后通分
=2x/x(x+1)-(x-1)/x(x+1)
=(2x-x+1)/x(x+1)
=1/x
郝平啊亲
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