红球为x
x*(1+3/8)+(119-x)*(1-2/5)=121
x=64
119-64=55个白球
盒子里有红球和白球119个,将红球增加到八分之三,白球减少五分之二后,红白球现在共121个原来各多少?怎样算
盒子里有红球和白球119个,将红球增加到八分之三,白球减少五分之二后,红白球现在共121个原来各多少?怎样算
数学人气:893 ℃时间:2020-03-07 17:24:06
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