30%x +30 - (x-30%x-30)/4 =100怎么解?
问题描述:
30%x +30 - (x-30%x-30)/4 =100怎么解?
能细就细
答
30%x +30 - (x-30%x-30)/4 =100
0.3x+30-(0.7x-30)/4=100
0.3x-0.175x+37.5=100
0.125x=62.5
x=500