很多种简便算法啊(1)3.2*1.8+2.54=(3+0.2)*1.8+2.54=5.4+(0.36+2.54)=5.4+2.9=8.3(2)3.2*1.8+2.54=(2-0.2)*3.2+2.54=6.4+(2.54-0.64)=6.4+1.9=8.3(3)3.2*1.8+2.54=(2+1.2)*1.8+2.54=3.6+(2.16+2.54)=3.6+4.7=8.3(1.8*1.2=2.16首同末和十)希望能帮到你啊:)