1X/4+(180-X)=6/5(180-X)怎么解
问题描述:
1X/4+(180-X)=6/5(180-X)怎么解
答
1X/4+(180-X)=6/5(180-X)
乘以20得 5x+20(180-x)=24(180-x)
5x=4(180-x)
5x=720-4x
9x=720
x=80