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数学
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1/x²-y²,1/x²+xy.通分
人气:117 ℃ 时间:2020-03-28 14:50:26
解答
1/x²-y²= 1/(X+Y)(X-Y)
1/x²+xy= 1/ X(X+Y)
通分
1/x²-y²= X /X(X+Y)(X-Y)
1/x²+xy=(X-Y)/X(X+Y)(X-Y)
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