5分之1×8+0.6×0.2+5分之1×40%

问题描述:

5分之1×8+0.6×0.2+5分之1×40%

5分之1×8+0.6×0.2+5分之1×40%
=五分之八+0.12+0.08
=1.6+0.12+0.08
=1.72+0.08
=1.78

1.8

5分之1×8+0.6×0.2+5分之1×40%
=1/5*(8+0.6+0.4)
=9/5