10.76-0.83+1.24-4.17 3.5/0.56 45/0.18 81.3-81.3x0.9這幾題的簡便計算怎樣算
10.76-0.83+1.24-4.17 =(10.76+1.24)-(0.83+4.17)=12-5=73.5/0.56 =3.5÷(0.7×0.8)=3.5÷0.7÷0.8=5÷0.8=6.2545/0.18 =45÷(0.9×0.2)=45÷0.9÷0.2=50÷0.2=25081.3-81.3x0.9=81.3×(1-0.9)=81.3×0.1=8.13
小數的簡便運算3.6×0.75×1.2÷(1.5×24×0.18)
3.6×0.75×1.2÷(1.5×24×0.18)
=3.6×0.75×1.2÷(1.5×2.4×1.8)(注:3.6÷1.8=2,1.2÷2.4=1÷2=2分之1,0.75÷1.5=1÷2=2分之1)
=2÷(2×2)
=2分之1
簡便計算;3.24×4分之1+0.25×4.76
3.24×4分之1+0.25×4.76
=(3.24+4.76)×0.25
=8×0.25
=2
簡便計算;(-370)*(-1/4)+0.25*24.5+(+5又1/2)*4/1
簡便計算
(-370)*(-1/4)+0.25*24.5+(+5又1/2)*1/4
=(370+24.5+5.5)*1/4
=400*1/4
=100