x/3=(x-120)/60 * 30 怎么解
问题描述:
x/3=(x-120)/60 * 30 怎么解
答
x/3=(x-120)/60 * 30
x/3=(x-120)*1/60*30
x/3=(x/60-2)*30
x/3=x/2-60
x/3-x/2=-60
-x/6=-60
x=60*6
x=360