乘法: 5.6×2.9=16.24 5.22×0.3=1.566 5×2.44=12.2 5.6×6.5=36.4 8.9×2.4=21.36 1.384×5.1=7.0584 0.059×0.2=0.0118 9.46×2.85=26.961 2.5×0.88=2.2 7.658×85=650.93 除法: 85.44÷16=5.34 67.5÷15=4.5 0.736÷23=0.032 39.6÷24=1.65 51.3÷0.27=190 0.66÷0.3=2.2 38.4÷0.8=48 42.84÷7=6.12 230.4÷6=38.4 43.5÷12=3.625 6.21÷0.03=207 91.2÷3.8=24 11.97÷1.5=7.98 15÷0.06=250 101.7÷9=11.3 21.24÷36=0.59 35.21÷7=5.03 210÷1.4=150 0.756÷0.18=4.2 69.6÷2.9=24 3.77×1.8=6.786 9.99×0.02=0.1998 1.666×6.1=10.1626 4.88×2.9=14.152 5.5×55=302.5 8.78×83=728.74 4.268×1.7=7.2556 17.8×6.4=113.92 5.555×5.2=28.886 36.02×0.3=10.806 0.02×96=1.92 4.67×0.9=4.203 9.432×0.002=0.018864 5.61×4.3=24.123 9.77×0.02=0.1954 2.6×61=158.6 57×5.7=324.9 1.5×4.9=7.35 2.22×3.33=7.3926 56.78×8=454.24 (循环小数的用简便方法,除不尽保留 2 位小数) : 8.2÷0.12=68.33… 4.7÷3=1.566… 0.8÷0.9=0.88… 1.25÷1.2=1.04166… 8.33÷6.2≈1.34 76.4÷5.4=14.148148… 32÷42=0.761904761904… 1.7÷0.03=56.66… 14.36÷2.7=5.3185185… 2.41÷0.7=3.44285714285714… 计算 0.396÷1.2=0.33 0.18×15=2.7 0.04×0.12=0.0048 7.15×22=157.3 16.9÷0.13=130 13.76×0.8=11.008 6.4×0.5=3.2 35.4×4.2=148.68 0.25×0.046=0.0115 0.12×0.5×0.16=0.0096 0.756÷0.36=2.1 0.025×14=0.35 15.6×13=202.8 3.06×36=110.16 3.84×2.6≈10.0(保留一位小数) 5.76×3=17.28 90.75÷3.3=27.5 3.68×0.25=0.92 3.7×0.016=0.0592 8.4×1.3=10.92 5.25×5=26.25 0.76×0.32=0.2432 1.08×25=27 1.55÷3.9=0.39743589743589… 5.2×0.6=3.12 4.48×0.4=1.792 0.042×0.54=0.02268 2.52×3.4=8.568 4.8×0.25=1.2 0.125×1.4≈0.18(保留两位小数) 10.1÷3.3=3.0606…(商用循环小数) 3.25×9.04= 29.38(用除法验算) 3、脱式计算(能简算的要简算) 2.5×7.1×4 =(2.5×4)×7.1 =10×7.1 =71 2.5÷0.7≈3.571(保留三位小数) 10.75÷12.5=0.86(用乘法验算) 16.12×99+16.12 =16.12×(99+1) =16.12×100 =1612 5.2×0.9+0.9 =(5.2+1)×0.9 =6.2×0.9 =5.58 7.28×99+7.28 =7.28×(99+1) =7.28×100 =728 4.3×50×0.2 =4.3×(50×0.2) =4.3×10 =43 64-2.64×0.5 =64-1.32 =62.68 26×15.7+15.7×24 =(26+24)×15.7 =50×15.7 =78.5 3.94+34.3×0.2 =3.94+6.86 =10.8 (2.275 +0.625)×0.28 =2.9×0.28 =0.812 1.2×(9.6÷2.4)÷4.8 =1.2×4÷4.8 =4.8÷4.8 =1 8.9×1.1×4.7 =9.79×4.7 =46.013 8.05×3.4+7.6 =27.37+7.6 =34.97 32+4.9-0.9 =36.9-0.9 =36 2.7×5.4×3.9 =14.58×3.9 =56.862 6.58×4.5×0.9 =29.61×0.9 =26.649 4.8-4.8×0.5 =4.8-2.4 =2.4 3.6×9.85-5.46 =35.46-5.46 =30 2.8×0.5+1.58 =1.4+1.58 =2.98 (1.25-0.125)×8 =1.25×8-0.125×8 =10-1 =9 4.8×100.1 =4.8×100+4.8×0.1 =480+0.48 =480.48 4.85 + 0.35 ÷ 1.4 =4.85+0.25 =5.1 56.5×99+56.5 =56.5×(99+1) =56.5×100 =5650 7.09×10.8-0.8×7.09 =7.09×(10.8-0.8) =7.09×10 =70.9 8.7 × 17.4 - 8.7 × 7.4 =8.7×10 =87 12.5×0.4×2.5×8 =(12.5×8)×(0.4×2.5) =100×1 =100 0.68 ÷(5.2 -3.5)× 1.25 =0.68÷1.7×1.25 =0.4×1.25 =0.5 4.8 ×(15 ÷ 2.4) =4.8×6.25 =30 0.87×3.16+4.64 =2.7492+4.64 =7.3892 9.5×101 =9.5×100+9.5 =950+9.5 =959.5 40.5 ÷ 0.81 × 0.18 =50×0.18 =9 6.81+6.81×99 =6.81×(1+99) =6.81×100 =681 0.25×185×40 =(0.25×40)×185 =10×185 =1850 4.4×0.8-3.4×0.8 =(4.4-3.4) ×0.8 =1×0.8 =0.8 (9.37+9.37+9.37+9.37)× 2.5 =(9.37×4) ×2.5 =9.37×(4×2.5) =9.37×10 =93.7 2.37×6.3+2.37×3.7 =2.37×(6.3+3.7) =2.37×10 =23.7 2.5×1.25×0.32 =2.5×1.25×0.4×0.8 =(2.5×0.4) ×(1.25×0.8) =1×1 =1 3.8×10.1 =3.8 ×10+3.8×0.1 =38.38 2.5×(3.8×0.04) =2.5×0.04×3.8 =0.38 7.69×101 =7.69×100+7.69 =776.69 0.25×39+0.25 =0.25×(39+1) =0.25×40 =10 (8×5.27) ×1.25 =(8×1.25) ×5.27 =10×5.27 =52.7 6.8×0.75÷0.5 =5.1÷0.5 =10.2 9.5×99 =9.5×(100-1) =9.5×100-9.5 =950-9.5 =940.5 0.125×72 =0.125×8×9 =1×9 =9 6.81+6.81×99 =6.81×(1+99) =6.81×100 =681 3.75÷0.125–2.75 =30-2.75 =27.25 13.5×0.98 =13.5×(1-0.02) =13.5-13.5×0.02 =13.5-0.27 =13.23 46×0.33+54×0.33 =(46+54) ×0.33 =100×0.33 =33 0.25×185×40 =0.25×40×185 =10×185 =1850 1.53+23.4÷7.2 =1.53+3.25 =4.78 12.5×8.8 =12.5×(8+0.8) =12.5×8+12.5×0.8 =100+10 =110