100÷(2/7-1/4)=100÷1/28=2800米
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修一条路,第一天修了全长的1/4,第二天修了100米,已修的与未修的比是2比5,这条路有多少米
修一条路,第一天修了全长的1/4,第二天修了100米,已修的与未修的比是2比5,这条路有多少米
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数学人气:981 ℃时间:2019-08-20 21:01:33
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