这根钢管原来有X米
(2/7)X+4/5+9.2=X
X=14
一根钢管,第一次截去它的2/7,第二次又截去4/5M,还剩下9.2M这根钢管原来多少长?
一根钢管,第一次截去它的2/7,第二次又截去4/5M,还剩下9.2M这根钢管原来多少长?
数学人气:994 ℃时间:2019-11-21 23:26:21
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