解方程组:20%*x*y=12000 10%*x*(y+100)=12000+4000
问题描述:
解方程组:20%*x*y=12000 10%*x*(y+100)=12000+4000
要详细过程~~~
答
{20%*x*y=12000 (1)
{10%*x*(y+100)=12000+4000 (2)
(1)式可化为:x*y=60000 (3)
(2)式可化为:x*(y+100)=160000
即:xy+100x=160000 (4)
(3)式代入(4)式可得:
100x=100000
解得:x=1000,y=60