x/12乘以360=90

问题描述:

x/12乘以360=90

90/360=x/12
360x=12*90
x=3

x/12乘以360=90
x/12=90/360
12*90=360x
x=3

x/12×360=90
30x=90
x=3

解x/12=90/360
x/12=1/4
x=12*(1/4)
x=3