请先化简x/(x^2-x )-1/(x+1),在选取一个使原式有意义的数代入求值.

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请先化简x/(x^2-x )-1/(x+1),在选取一个使原式有意义的数代入求值.
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请先化简x/(x^2-x )-1/(x+1),在选取一个使原式有意义的数代入求值.
请先化简x/(x^2-x )-1/(x+1),在选取一个使原式有意义的数代入求值.

请先化简x/(x^2-x )-1/(x+1),在选取一个使原式有意义的数代入求值.
x/(x^2-x )-1/(x+1)=1/(X-1)-1/(X+1)=2/(X^2-1)
X≠0,X≠1,X≠-1,
当X=2时,原式=2/3.

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