化简求值x/(x-1)-3/(x-1)(x+2)-1x=-(-查字典问答网
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来自乔志刚的问题

  化简求值x/(x-1)-3/(x-1)(x+2)-1x=-(2/3)

  化简求值

  x/(x-1)-3/(x-1)(x+2)-1

  x=-(2/3)

1回答
2020-01-31 20:41
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  x/(x-1)-3/(x-1)(x+2)-1=x(x+2)/(x-1)(x+2)-3/(x-1)(x+2)-(x-1)(x+2)/(x-1)(x+2)=[x(x+2)-3-(x-1)(x+2)]/(x-1)(x+2)=[x^2+2x-3-(x-1)(x+2)]/(x-1)(x+2)=[(x+3)(x-1)-(x-1)(x+2)]/(x-1)(x+2)=(x-1)[(x+3)-(x+2)]/(x-1...

2020-01-31 20:45:48

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