(8/10)+(x/15)=(8/12)+[(8-x)/15]

问题描述:

(8/10)+(x/15)=(8/12)+[(8-x)/15]

(8/10)+(x/15)=(8/12)+[(8-x)/15]
10,12,15最小公倍数是60
两边乘以60
48+4x=40+4(8-x)
8+4x=32-4x
8x=24
x=3