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1、精選優(yōu)質(zhì)文檔-傾情為你奉上小數(shù)乘法小數(shù)加、減法結(jié)合律：(a+b)+c=a+(b+c)(a×b) ×c=a×(b×c)乘法分配律a×（b+c）=a×b+a×ca×b+a×c =a×（b+c）脫式計(jì)算（按照運(yùn)算順序）1.14×0.7= 4.5×28= 7.4×20= 6.2×1.4=5.4×2.6=26.8+3.02= 6.07-4.993= 3.7+2.36= 15.4+2.97= 10.2-8.75=2.5×1.9×442&#

2、215;1.25×0.086.94.83.1 0.66.22+3.7825×0.23×0.4（40+0.8）×2.512.5×（0.8+80）30×（1.5+0.1）3.25×23-3.25×13 0.28×188×0.2812.83(8.453.69) 100(8.75.24) 84.066.475.19 5.43+(15.27+30.29)2.8×1.430.572.3×1.4= 3.7×1.8= 5.2×1.6=3.6×0.8= 0.66&

3、#215;1.4= 7.3-2.25= 3.8+3.54= 3.05-2.9= 3.1-2.07= 12.7+6.58=1.2×0.04×25320×1.25×818.76-3.47-0.53 5.17-1.8-3.20.4×23×2.50.36×34+0.36×667.5×2.3+2.5×2.3(1.250.125)×84.5×5.2+4.5×4.87.64×2.5-3.64×2.55.03-2.5+0.96 22.8-5.23-9.25 9.

4、29+3.7×6.3   8.02-5.4+0.984.6×570.23×80.42×0.8= 0.24×0.19= 2.4×1.3= 4.5×2.3=0.72×0.27=28-3.56= 10-0.81= 10-0.36= 20-0.92= 8-7.089=0.25×21×401.25×21×0.84.025.40.98 5.171.83.2 3.687.562.686.3×43+57×6.317.01×9+17.019.71

5、5;2.3+7.7×9.71（100-0.4）×2.510×（5.2+12.3）67.2+41.5-71.39 10.75+（0.4+9.4） 16.23+8.92-7.56 50-28.5×1.2 13.79-9.53+10.5745×1.2= 107×4.6= 76×0.37= 0.28×0.27= 0.75×0.42=96.85-85= 45.45-45= 10-0.41= 45-0.45= 3.57+3=0.13×25×0.4（24×2.5）×0.0470.

6、8-1.25-1.75 4.02-3.5+0.98 4.25-0.83+0.75（2.50.25）×0.47.9×10.80.8×7.918.76×9.918.76（8+0.8）×12.526×15.7+15.7×241.5+0.68-0.6 72.8-8.6+5.84 20.8-（15.98-3.9） 32.5+（5.07+6.1） 3.52-（4.6-3.82）5.61×2.9= 3.77×1.8= 0.02×96= 5.22×0.3=9.99×0.89=5.8-3.25

7、= 4.8+18.09= 10.3+58.7= 8.3-4.56= 9.03-8.5=12.5×0.35×825×3.1×0.448.14-2.43-7.57 4×2.3×2.50.5×15.8×0.24.8×7.87.8×0.5227.5×3.77.5×3.7（0.8+8）×12.52.5×0.6-1.5×0.62.5×（40-0.4）3.2×0.36-4.8 0.566.23.78 45×2150×2.

8、15.45+2.65×2.20.65×90+4.25.63×70=75.6×90=80×0.78=8.06×0.04=1.33×8.9=5.94+10.7= 12.3+0.85= 37.8+3.02= 0.704-0.25= 10.1-0.55=48×0.5×0.447×50×0.24×6.32×2.512.5×2.5×0.8×40.25×12.8×0.40.93×6+0.93×4 （0.4+10

9、）×2.5 3.25×23-3.25×13 0.28×188×0.281.25×（100+0.8）50.4×1.9-1.872×0.81+10.412.4-4.09×1.33.2×（14.7-7.65）3.76+0.25+0.40.68×0.77=45.6×0.26=9.57×0.21=38×6.75=7.04×7.8=4.1+2.53= 5.07-0.8= 5.7-0.73= 13.18+5.27= 5.16+7.9=1.25×26&

10、#215;807.62+2.6+2.3812-0.28-0.720.25×12.9×0.40.25×32×12.53.65×88+3.65×120.125×（8+0.8）2.5×（10+0.4）0.27×5.6+4.4×0.27（0.4+40）×2.523.66+4.34-3.56 5.6-0.81-1.29 15.9+3.26+4.175.83×24.271.3+4.7×0.91.42×0.25= 4.06×0.06= 60.5×2.

11、1= 20×0.78= 2.64×0.2=1.4-0.55= 3.6+0.46= 43.5-27.34= 15.08-3.9= 75.6-3.55=20.15+7.62+7.85 51.27-8.66-1.34 8×（1.25×12）0.25×4.7×40（0.4×0.02）×2.533.3×19+33.32.9×2.5+17.1×2.5（8+0.8）×12.52.5×12.4-2.4×2.5(1.250.125)×86.9-4.83.19.293.7-6.3   8.2-5.4-0.986.4×0.253.6×40.6+0.4×5.5四年級(jí)數(shù)學(xué)下冊(cè)計(jì)算訓(xùn)練專心-專注-專業(yè)