1/4x+(2200-x)*1/5=500怎样解?

问题描述:

1/4x+(2200-x)*1/5=500怎样解?

(1/4)x+(2200-x)*1/5=500
两边乘以20得
5x+4(2200-x)=10000
5x+8800-4x=10000
x=1200