5.78乘以3分之5加上22%除以5分之3
=5.78x5/3+0.22x5/3
=5/3x(5.78+0.22)
=5/3x6
=10
（2分之加上3分之1减去4分之1）除以12分之1
=(1/2+1/3-1/4)x12
=1/2x12+1/3x12-1/4x12
=6+4-3
=7