解方程组{x+y=200,100x:(1.5×100y)=3:
问题描述:
解方程组{x+y=200,100x:(1.5×100y)=3:
答
由二式得,4.5y=4x,代入一式得,可求出X
答
x+y=200,①
100x:(1.5×100y)=3:4
400x=4.5*100y
4x=4.5y
x=4.5y/4 ②
把②代人①得:
4.5y/4+y=200
8.5y=800
y=1600/17
x=1800/17