计算:3/x+1-12/x^2-1-6/1-x快
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计算:3/x+1-12/x^2-1-6/1-x快计算:3/x+1-12/x^2-1-6/1-x快计算:3/x+1-12/x^2-1-6/1-x快3/x+1-12/x^2-1-6/1-x=3/(x+1)
计算:3/x+1-12/x^2-1-6/1-x快
计算:3/x+1-12/x^2-1-6/1-x
快
计算:3/x+1-12/x^2-1-6/1-x快
3/x+1-12/x^2-1-6/1-x
=3/(x+1)-12/(x+1)(x-1)+6/(x-1)
=[3(x-1)-12+6(x+1)]/(x+1)(x-1)
=(9x-9)/(x+1)(x-1)
=9/(x+1)
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