计算:(3/x)+(x/x²-1)-(4/1-x)
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Why
计算:(3/x)+(x/x²-1)-(4/1-x)
计算:(3/x)+(x/x²-1)-(4/1-x)
计算:(3/x)+(x/x²-1)-(4/1-x)
由原式=3/x+x/(x+1)(x-1)+4/(x-1)
=[3(x²-1)+x²+4(x²-1)]/x(x+1)(x-1)
=(4x³+4x²-4x-3)/x(x+1)(x-1)