`48m 67mm=48067mm`
`3^x+15=42`
`3^x=42-15`
`3^x=27`
`3^x=3^3`
`=>x=3`
chi tiết dữ :")
`8/3=2 2/3`
`15/6=2 1/2`
`85/12=7 1/12`
`5/2=2 1/2`
35 x 6 - 70 x3? + 35