1、直接寫出得數(shù)0.45×2.5＝ 0.8×1.25＝ 0.3×3.6＝ 0.3×0.3＝ 10×0.07＝ 0.3×1.4＝ 0.05×7＝ 0.92×0.4＝ 0.2×0.26＝ 0.14×4＝ 0.02×0.1＝ 1.2×0.3＝0.2×0.4＝ 8.2＋1.8＝ 100－35.22＝ 2.3×4＝ 2.5×0.4＝ 2.4×5＝ 0.22×4＝ 3.25×0＝0.9－0.52＝ 3.99×1＝ 0×3.52＝ 12.5×8＝ 1÷0.5= 8÷10 = 10-1.8-7.2= 0.43+3.57= 2.5×4×12= 1.05×100= 0.9×0.8= 0.96÷3= 1.47÷0.7= 5.4÷6= 4÷0.8 =0.16.5×10= 0.56×100= 3.78×100= 3.215×100= 0.8×10= 4.08×100= 1.1×0.2 = 0.6×0.8 = 3×0.9= 2.5×0.4= 3.6×0.4= 12.5×8= 50×0.04= 80×0.3 = 1.1×9= 0.16×5 ＝ 1.78＋2.2 = 9.6÷0.6 = 1.2×0.5-0.4 = 0.7÷0.01 = 2.5×0.4 = 12－3.9= 1.25×8÷1.25 = 6.6÷0.66 = 5.37×0+4.63 = 4.2÷3.5＝ 1.6+2.4×0.3 = 2.14－0.9＝ 27＋456＋73= 0.3×0.3= 7.2＋2.8＝ 0.9÷0.01＝ 12÷0.3= 2.87÷0.7＝ 13÷4＝ 0.96÷0.3＝ 1.5×0.4＝ 7÷0.25＝ 2.5×0.7×0.8= 8－2.5＝ 16÷1.6＝ 5.6×1.01= 8×（2.5＋0.25）＝ 0.36＋0.64＝ 64.32÷16＝ 72.8÷0.8＝ 8.4÷4.2＝ 13.8＋9.9＝ 2.4×2.5＝ 0.05×0.8＝ 1.25×0.8×0.5＝ 12×2.5＝ 1.23×3＝ 3.2÷1.6＝ 3.5＋3.5×3＝ 19.6÷2＝ 8.8÷2.2= 0.75×4＝ （1.5＋0.25）×4＝ 0.5×0.8=8.4×0.2= 1.6×0.2＝ 7.2×0.3= 2.8×0.3＝ 0.9÷0.15= 1.8×0.4= 5.5÷0.55= 0.08×100= 2.2÷0.11= 5.46＋4.54= 12.5×0.8= 0.35×0.3= 1.4×5= 2.8×4= 19.6÷4= 22.5×4=2、用豎式計(jì)算 0.396÷1.2= 0.756÷0.36= 15.6×13= 0.18×15= 0.025×14= 3.06×36=0.04×0.12＝ 3.84×2.6≈ 5.76×3＝ （保留一位小數(shù)） 7.15×22 90.75÷3.3 3.68×0.216.9÷0.13 1.55÷3.9 3.7×0.01613.76×0.8= 5.2×0.6 8.4×1.3 6.4×0.5 4.48×0.4 5.25×5 35.4×4.2 0.042×0.54 0.76×0.32 0.25×0.046 2.52×3.4 1.08×25 0.12×0.5×0.16＝ 4.8×0.25＝ 0.125×1.4（保留兩位小數(shù)）2.5÷0.7= （保留三位小數(shù)） 10.1÷3.3= （商用循環(huán)小數(shù)）10.75÷12.5= （用乘法驗(yàn)算） 3.25×9.04= （用除法驗(yàn)算）3、脫式計(jì)算（能簡(jiǎn)算的要簡(jiǎn)算）2.5×7.1×4 16.12×99＋16.12 5.2×0.9＋0.97.28×99+7.28 4.3×50×0.2 64－2.64×0.5 3.94+34.3×0.2 26×15.7＋15.7×24 (2.275 ＋0.625)×0.28 1.2×(9.6÷2.4)÷4.8 8.9×1.1×4.7 2.7×5.4×3.9 3.6×9.85-5.46 8.05×3.4+7.6 6.58×4.5×0.9 2.8×0.5+1.5832＋4.9－0.9 4.8－4.8×0.5 (1.25－0.125)×84.8×100.1 56.5×99＋56.5 7.09×10.8－0.8×7.094.85 + 0.35 ÷ 1.4 8.7 × 17.4 - 8.7 × 7.4 2．13.×0.×825712.5×0.4×2.5×8 0.87×3.16+4.64 9.5×101 0.68 ÷（5.2 -3.5）× 1.25 4.8 ×（15 ÷ 2.4） 40.5 ÷ 0.81 × 0.18 6.81+6.81×99 0.25×185×40 4 .4×0.8－3.4×0.8 0.25×39+0.25(9.37+9.37+9.37+9.37)× 2．5 4.2.×1.＋1.×1.75 46×0.33+54×0.32.37×6.3+2.37×3.7 2.5×1.25×0.32 3.8×10.1 0.125×72 2.5×(3.8×0.04) 7.69×101 3.8×10.1 。