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计算:( x-1)/x÷[x-(1/x)]
人气:195 ℃ 时间:2020-04-07 13:17:32
解答
( x-1)/x÷[x-(1/x)]
=(x-1)/x÷(x²-1)/x
=(x-1)/x×x/(x²-1)
=1/(x+1);
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