设堆煤有x吨
x-(1/4x+21)*2/3-1/4x=21
x-1/6x-14-1/4x=21
x-1/6x-1/4x=35
(1-1/6-1/4)x=35
7/12x=35
x=60
1、 一堆煤,第一次运走它的1/4,第二次 运走21吨,这时余下的吨数是运走的2/3,这堆煤有几吨?
1、 一堆煤,第一次运走它的1/4,第二次 运走21吨,这时余下的吨数是运走的2/3,这堆煤有几吨?
数学人气:291 ℃时间:2020-02-06 08:34:35
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