2012贵州先化简1/x+1-3-x/x2-6x+91/(x+1)-[(3-x)/(x^2-6x+9)]÷[(x^2+x)/(x-3)]=1/(x+1)+[(x-3)/(x-3)^2][(x-3)/(x^2+x)]=1/(x+1)+1/(x^2+x)=1/(x+1
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2012贵州先化简1/x+1-3-x/x2-6x+91/(x+1)-[(3-x)/(x^2-6x+9)]÷[(x^2+x)/(x-3)]=1/(x+1)+[(x-3)/(x-3)^2][(x-3)/(
2012贵州先化简1/x+1-3-x/x2-6x+91/(x+1)-[(3-x)/(x^2-6x+9)]÷[(x^2+x)/(x-3)]=1/(x+1)+[(x-3)/(x-3)^2][(x-3)/(x^2+x)]=1/(x+1)+1/(x^2+x)=1/(x+1
2012贵州先化简1/x+1-3-x/x2-6x+9
1/(x+1)-[(3-x)/(x^2-6x+9)]÷[(x^2+x)/(x-3)]
=1/(x+1)+[(x-3)/(x-3)^2][(x-3)/(x^2+x)]
=1/(x+1)+1/(x^2+x)
=1/(x+1)+1/[x(x+1)]
=(x+1)/[x(x+1)]
=1/x
=1/√2
=√2/2
为什么还要 =√2/2
2012贵州先化简1/x+1-3-x/x2-6x+91/(x+1)-[(3-x)/(x^2-6x+9)]÷[(x^2+x)/(x-3)]=1/(x+1)+[(x-3)/(x-3)^2][(x-3)/(x^2+x)]=1/(x+1)+1/(x^2+x)=1/(x+1
一般分母不能是无理数形式,这是规定
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