x/(1-80%)+(57-x)/(1-90%)=470 哪个帮忙解下这个方程
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x/(1-80%)+(57-x)/(1-90%)=470 哪个帮忙解下这个方程
x/(1-80%)+(57-x)/(1-90%)=470 哪个帮忙解下这个方程
x/(1-80%)+(57-x)/(1-90%)=470 哪个帮忙解下这个方程
x/(1-80%)+(57-x)/(1-90%)=470
x/0.2+(57-x)/0.1=470
5X+570-10x=470
5X=570-470
X=20
x/(1-80%)+(57-x)/(1-90%)=470
x/0.2+(57-x)/0.1=470
5x+570-10x=470
5x=100
x=20
左边=5X+10(57-X)=570-5X=右边=470
所以,X=20
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