因为第一天修了25%,第二天修了30%
所以两天一定修了25%+30%=55%
则还剩下1-55%=45%
因为还剩下900米没修
所以 900/45%=2000
工程队修一条水渠第一天修全长的25%,第二天修了全长的30%还剩下900米没修,这条渠全长多少米?并说出原因
工程队修一条水渠第一天修全长的25%,第二天修了全长的30%还剩下900米没修,这条渠全长多少米?并说出原因
数学人气:842 ℃时间:2019-08-21 20:32:47
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