(x+1/x-1) -(x-1/x+1)-4/x怎么化简
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原式=[(x+1)²-(x-1)²]/(x+1)(x-1)-4/x
=(x²+2x+1-x²+2x-1)/(x+1)(x-1)-4/x
=4x/(x+1)(x-1)-4/x
=[4x²-4(x+1)(x-1)]/x(x+1)(x-1)
=[4x²-4(x²-1)]/x(x²-1)
=4/(x³-x)
=(x²+2x+1-x²+2x-1)/(x+1)(x-1)-4/x
=4x/(x+1)(x-1)-4/x
=[4x²-4(x+1)(x-1)]/x(x+1)(x-1)
=[4x²-4(x²-1)]/x(x²-1)
=4/(x³-x)
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