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数学
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(14+x)/(60+x)=1/3解方程要过程
人气:302 ℃ 时间:2020-03-26 10:51:46
解答
(14+x)/(60+x)=1/3
14+x=20+x/3
x-x/3=20-14
2x/3=6
x=9
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