1/4x+(2200-x)*1/5=500怎样解?
问题描述:
1/4x+(2200-x)*1/5=500怎样解?
答
(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