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四年级数学含小数的脱式简便计算

2012年1月28日星期六一、口算题小数加法:0.3+1.5=2.5+9.8=7.6+1.3=4.4+5.7=2.3+7.7=5.7+3.1=7.69+2.31=9.16+2.64=5.68+12.22=16.8+16.5=小数减法:6.8-3.8=4.26-3.71=0.88-2.12=5.34-69.21=68.4-61.5=9.58-3.7=18.94-5.66=15.69-9.78=115-68.59...

458+251+749 196-26-74 536-249-136 813+569-213

这样的题目很多,举例如下: 4.1×67.2+4.8 9.42×2.1+4.6 8.24×5.4+6.4 1.2×0.4+7.8 3.08×7.5+4.3 4.17-3.5×2.6 4.1×85.1+7.4 1.25×9.01+0.3 84.4+1.4×5.2 4.27×0.35+4.8 9-3.6×1.25 8×0.4-2.1 5.2×4.3+8.7 9.4×7.2-7.4 6.04×1.04+8.4 4.81×2.4+1...

0.35×1.6+0.35×3.4 0.25×8.6×4 6.72-3.28-1.72 0.45+6.37+4.55 5.4+6.9×3-(25-2.5)2×41846-620-380 4.8×46+4.8×54 0.8+0.8×2.5 1.25×3.6×8×2.5-12.5×2.4 28×12.5-12.5×20 23.65-(3.07+3.65) (4+0.4×0.25)8×7×1.25

0.35×1.6+0.35×3.4 0.25×8.6×4 6.72-3.28-1.72 0.45+6.37+4.55 5.4+6.9×3-(25-2.5)2×41846-620-380 4.8×46+4.8×54 0.8+0.8×2.5 1.25×3.6×8×2.5-12.5×2.4 28×12.5-12.5×20 23.65-(3.07+3.65)

1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6–2/9×34.8×5/4+1/45.6÷3/8–3/8÷66.4/7×5/9+3/7×5/97.5/2-(3/2+4/5)8.7/8+(1/8+1/9)9.9×5/6+5/610.3/4×8/9-1/311.7×5/49+3/1412.6×(1/2+2/3)13.8×4/5+8×11/514.31×5/6–5/615.9/7-(2/7–10/21)16.5/...

9.5+4.85-6.13简便方法

3.34+4.75-2.07 5.32+4.39+3.11 6.65-(4.23+1.45) 12.7-6.6+3.24 6.56+3.45-3.36 8.75-(3.23+2.25) 6.7- 5.8 +2.03 8.6+3.72-5.55 6.14-(1.23+1.38) 7-5.5+3.06

0.4×125×25×0.8 =(0.4×25)×(125×0.8) =10×100=1000 1.25×(8+10) =1.25×8+1.25×10 =10+12.5=22.5 9123-(123+8.8) =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 9999×1001 =9999×(1000+1) =9999×1000+9999×1 ...

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

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