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x/1500+x/1200=9
人气:131 ℃ 时间:2020-02-20 14:56:09
解答
x÷5000+x÷1200=9
x×1/5000+x×1/1200=9
x×(1/5000+1/1200)=9
3/2000x=9
x=9÷3/2000
x=6000
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