1×(1-8%)×5%=0.0461×8%=0.08(0.46+0.08)÷1=12.6
8%+(1一8%)x5%=8%+92%X5%=8%+4·6%
1-(1-8%)×(1-5%)
1-((1-8%)*(1-5%))=12.6%
1-1×(1-80%)×(1+50%)