计算:(x²-1)/x*x/(x+1)+(3x+1)
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计算:(x²-1)/x*x/(x+1)+(3x+1)
计算:(x²-1)/x*x/(x+1)+(3x+1)
计算:(x²-1)/x*x/(x+1)+(3x+1)
(x²-1)/x×x/(x+1)+(3x+1)
=(x+1)(x-1)/x×x/(x+1)+(3x+1)
=x-1+3x+1
=4x
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