7/(XX+X)+1/(xx-x) =6/(xx-1)

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7/(XX+X)+1/(xx-x)=6/(xx-1)7/(XX+X)+1/(xx-x)=6/(xx-1)7/(XX+X)+1/(xx-x)=6/(xx-1)7/(XX+X)+1/(xx-x)=6/(x

7/(XX+X)+1/(xx-x) =6/(xx-1)
7/(XX+X)+1/(xx-x) =6/(xx-1)

7/(XX+X)+1/(xx-x) =6/(xx-1)
7/(XX+X)+1/(xx-x) =6/(xx-1)
两边同乘以x(x-1)(x+1),得
7x-7+x+1=6x
2x=6
x=3
经检验x=3是方程的根.

那个xx是平方的意思吗?



7/(XX+X)+1/(xx-x) =6/(xx-1)
7/X(X+1)+1/X(X-1)=6/(X+1)(X-1)
7(X-1)/X(X+1)(X-1)+(X+1)/X(X+1)(X-1)=6X/X(X+1)(X-1)
7(X-1)+(X+1)=6X
7X-7+X+1=6X
2X=6
X=3

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7/(XX+X)+1/(xx-x) =6/(xx-1)
7/X(X+1)+1/X(X-1)=6/(X+1)(X-1)
7(X-1)/X(X+1)(X-1)+(X+1)/X(X+1)(X-1)=6X/X(X+1)(X-1)
7(X-1)+(X+1)=6X
7X-7+X+1=6X
2X=6
X=3

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