求两道初三数学题的答案
1.(x-1分之1)-(x²-1分之x)=?2.[(x+1分之1)-(X-1分之1)]除以(x²-1分之2)=?...
1.(x-1分之1)-(x²-1分之x)=?
2.[(x+1分之1)-(X-1分之1)]除以(x²-1分之2)=? 展开
2.[(x+1分之1)-(X-1分之1)]除以(x²-1分之2)=? 展开
5个回答
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解:
如果是这样:
1、(x-1/1)-(x²-x/1)
=(x-1)-x²+x
=-(x²-2x+1)
=-(x-1)²
2、[(x+1/1)-(x-1/1)]÷(x²-2/1)
=[(x+1)-(x-1)]÷(x²-2)
=2÷(x²-2)
=2/(x²-2)
如果是这样:
1、1/(x-1)-x/(x²-1)
=(x+1)/(x²-1)-x/(x²-1)
=1/(x²-1)
2、【1/(x+1)-1/(x-1)】÷2/(x²-1)
=(x-1-x-1)/(x²-1)÷2/(x²-1)
=-1
如果是这样:
1、(x-1/1)-(x²-x/1)
=(x-1)-x²+x
=-(x²-2x+1)
=-(x-1)²
2、[(x+1/1)-(x-1/1)]÷(x²-2/1)
=[(x+1)-(x-1)]÷(x²-2)
=2÷(x²-2)
=2/(x²-2)
如果是这样:
1、1/(x-1)-x/(x²-1)
=(x+1)/(x²-1)-x/(x²-1)
=1/(x²-1)
2、【1/(x+1)-1/(x-1)】÷2/(x²-1)
=(x-1-x-1)/(x²-1)÷2/(x²-1)
=-1
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1、原式
=(x+1)/(x²-1)-1/(x²-1)
=x/(x²-1)
2、原式
=[(x-1)/(x²-1)-(x+1)/(x²-1)]÷2/(x²-1)
=-2/(x²-1)×(x²-1)/2
=-1
=(x+1)/(x²-1)-1/(x²-1)
=x/(x²-1)
2、原式
=[(x-1)/(x²-1)-(x+1)/(x²-1)]÷2/(x²-1)
=-2/(x²-1)×(x²-1)/2
=-1
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.(1)1/(x-1)-x/(x²-1)=[(x+1)-x]/(x²-1)=1/(x²-1)
(2).[(x+1分之1)-(X-1分之1)]/(x²-1分之2)=[(x-1)-(x+1)](x²-1)*(x²-1)/2=-1
(2).[(x+1分之1)-(X-1分之1)]/(x²-1分之2)=[(x-1)-(x+1)](x²-1)*(x²-1)/2=-1
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1 /(x-1)- x /(x²-1 )= (x+1) /(x-1)(x+1) - x /(x-1)(x+1) = 1 /(x²-1 )
2 [1/(x+1)-1/(X-1)] / [2/(x²-1 )]= [-2/(x²-1 )]/ [2/(x²-1 )] = -1
2 [1/(x+1)-1/(X-1)] / [2/(x²-1 )]= [-2/(x²-1 )]/ [2/(x²-1 )] = -1
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(1)-x/x加1(2)-1
追问
求过程
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