方程组x+y=480 (1+10%)x+(1+20%)y=554 怎么解
问题描述:
方程组x+y=480 (1+10%)x+(1+20%)y=554 怎么解
答
x+y=480
所以y=480-x
(1+10%)x+(1+20%)(480-x)=554
1.1x+576-1.2x=554
0.1x=22
x=220
y=480-x=260