小数乘法.docx
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小数乘法.docx
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小数乘法
小数乘法:
5.6×2.93.77×1.80.02×965.22×0.3
9.99×0.024.67×0.95×2.441.666×6.1
9.432×0.0025.6×6.54.88×2.95.61×4.3
8.9×2.45.5×559.77×0.021.384×5.1
8.78×832.6×610.059×0.24.268×1.7
57×5.79.46×2.8517.8×6.41.5×4.9
2.5×0.885.555×5.22.22×3.337.658×85
36.02×0.356.78×8
除法:
85.44÷1642.84÷7101.7÷9
67.5÷15230.4÷621.24÷36
0.736÷2343.5÷1235.21÷7
39.6÷246.21÷0.03210÷1.4
51.3÷0.2791.2÷3.80.756÷0.18
0.66÷0.311.97÷1.569.6÷2.9
38.4÷0.815÷0.06
(循环小数的用简便方法,除不尽保留2位小数):
8.2÷0.120.8÷0.976.4÷5.4
4.7÷31.25÷1.232÷42
14.36÷2.78.33÷6.21.7÷0.03
2.41÷0.7
用竖式计算
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=(保留一位小数)
7.15×22=90.3÷3.3=3.68×0.25=
16.9÷0.13=1.55÷3.9=3.7×0.016=
13.76×0.8=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≈(保留两位小数)
2.5÷0.7=(保留三位小数)10.1÷3.3=(商用循环小数)
10.75÷12.5=(用乘法验算)3.25×9.04=(用除法验算)
3、脱式计算(能简算的要简算)
2.5×7.1×416.12×99+16.125.2×0.9+0.9
7.28×99+7.284.3×50×0.264-2.64×0.5
26×15.7+15.7×24(2.275+0.625)×0.28
3.94+34.3×0.21.2×(9.6÷2.4)÷4.8
8.9×1.1×4.72.7×5.4×3.93.6×9.85-5.46
8.05×3.4+7.66.58×4.5×0.92.8×0.5+1.58
32+4.9-0.94.8-4.8×0.5(1.25-0.125)×8
4.8×100.156.5×99+56.57.09×10.8-0.8×7.09
4.85+0.35÷1.48.7×17.4-8.7×7.4
12.5×0.4×2.5×80.87×3.16+4.649.5×101
0.68÷(5.2-3.5)×1.25
40.5÷0.81×0.184.8×(15÷2.4)
6.81+6.81×990.25×185×404.4×0.8-3.4×0.8
(9.37+9.37+9.37+9.37)×2.5
2.37×6.3+2.37×3.72.5×1.25×0.323.8×10.1
2.5×(3.8×0.04)7.69×1013.8×10.1
0.25×39+0.250.125×7246×0.33+54×0.33
(8×5.27)×1.256.81+6.81×990.25×185×40
6.8×0.75÷0.53.75÷0.125–2.751.53+23.4÷7.2
9.5×9913.5×0.9812.5×8.8
二、解方程:
54-X=247X=49126÷X=42
13+A=28.52.4X=26.47.5x-3x=18
5×1.3-2x=5.524x+6x=63.65.6x+4.4x=5.2
x+3.86=5.4617.89-x=12.8940.8+x=57.3
x-3.25=162x+0.82=8.23+0.5x=7
7.8÷x=2.680x÷4=125-0.9x=2.75
2x+0.4x=486-2x+6x=1835x+13x=9.6
0.52×5-4x=0.60.7(x+0.9)=421.3x+2.4×3=12.4
3.5x=1402x+5=4015x+6x=168
5x+1.5=4.513.7—x=5.294.2×3—3x=5.1(写出检验过程)
20.5-4x=8.13.6x÷1.2=9.7518×1.5-1.7x=13.4
18.5x-9.9x=1.7219.2x+1.5x=32.17.2×5-8x=11.2
4x+3×0.7=6.5
(口算)
0.6×1.2=0.84÷0.6=4.5×0.1=
15×0.4=0.1×0.5=2.8÷7=
100÷0.01=1.4×3=0.72÷8=
6÷0.03=0.5×0.6=40×0.9=
口算:
4÷0.5=7×2.1=8.89+0.1=
24×0.25=0.1÷0.01=2.4×0.8=
9×0.4=10×0.01=30.2-3.02=
4.3-0.25=1-0.82=9.6÷0.3=
2.6×0.01=0×25.4=4.8×0.4=
7.2+2.8=12×2.5=2.63+0.37=
0.7×16-16×0.2=0.96÷0.3=1.5-4.5=
2.5×0.4=1.4×2.5×4=8-2.5=
6÷1.2=9.2÷2.3=24÷4+56÷4=
0.36+0.64=4÷0.25=1.8×5=
30×(200+3)=8.4÷4.2=8×1.5=
4.8÷0.3=2.73+1.5×4=
计算下面各题(能简算的要简算)
7.05×23.7+7.05×76.30.125×3.2×2.5
12.81-(1.5+7.81)8.7×2.6+6.4×8.7+8.7
1025-1125÷4.5×3.612.25-3.1+0.85-6.17
(1.9-1.9×0.9)÷(3.8-2.8)2.65×1.7+1.35×1.7
列竖式计算,得数保留一位小数。
1.2×1.4=0.37×8.4=3.14×2.8=
0.85×1.12=0.86×5.4=0.15×2.34=
40÷14=26.37÷31=45.5÷38=
竖式计算:
1560÷35=4.8÷2.3=1.55÷3.9=
7.2÷2.1=3.87÷7=146.4÷13=
5.63÷6.1=2.84×0.03=0.38×0.13=
26.37÷31=32÷42=2.84×0.03=
4.8÷23=0.382×0.13=4.2÷4.5=
列竖式计算
1.64+2.35=8.65-6.31=28.448÷14=
0.58×250=12.5+3.6=10.88÷34=
10-7.64=1.86×7=13.88-6.29=
26×0.15=8÷500=26.3+7.93=
23×7.06=100.2-2.28=44÷9=(精确到百分位)
三、计算(能简便的用简便方法计算)
8×25×1.25×164.04×25045.55-(6.82+15.55)
3.2×99+3.24.8×39+61×4.834.52-17.87-12.23
2.5×65+4.5×65489×101-4894.57+3.17+3.43+5.83
4.6×56+48×4.6-4.6×4
竖式计算:
18÷24=43.68÷26=25.3÷0.88=
0.1575÷3.15=0.612÷1.8=16.787÷0.28
(保留一位小数)
1、算下面各题
2.36×0.222.8×4.583.57÷4.2
82.8÷3645×2.463.6÷0.24
382.5÷456.4×5.48
2、简便计算
3.6×2.5+7.5×3.62.5×1.20.125×32
4.3×0.96.5×1023.25×99+3.25
18÷24=43.68÷26=25.3÷0.88=
0.1575÷3.15=0.612÷1.8=16.787÷0.28=
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