方程: 8.8X+11.2=20+4.8X, (500+392)/(6+X)=50
问题描述:
方程: 8.8X+11.2=20+4.8X, (500+392)/(6+X)=50
答
1,
8.8X+11.2=20+4.8X,
移项
8.8X-4.8X=20-11.2
合并
4X=8.8
X=2.2
2,
(500+392)/(6+X)=50
等式两边同乘以(6+X)
得500+392=300+50X
50X=592
X=118.4