4/5*3.5+5.5*80%+0.8簡便運算

4/5*3.5+5.5*80%+0.8簡便運算

80%=4/5=0.8
4/5*3.5+5.5*80%+0.8
=4/5*(3.5+5.5+1)
=4/5*10
=8