用简便方法计算下面各题.doc

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1、一、口算。10－2.65＝0÷3.8＝9×0.08＝24÷0.4＝67.5＋0.25＝6＋14.4＝0.77＋0.33＝5－1.4－1.6＝80×0.125=÷3×=二、用简便方法计算下面各题。1125－997998+1246+3.2＋+6.812－(1+2)400÷125÷825×（37×8）(－)×12××34×(2＋)125×8.84.35＋4.25＋3.65＋3.753.4×99＋3.417.15－8.47－1.5317－3－4÷2＋×0.125×0.25×3222.3－2.45－5.3－4.55(＋+)×74.25－3－(2－1)187.7×11－187.743×＋57.12

2、5×－0.52.42÷+4.58×－4÷36.28+5.74+3.72+5.2648×6.2+6.2×5225×125×4×816.9-5.6-4.49.08-（5.7+1.08）5.8×99+5.8360÷（1.2÷50）（40+1.25）×8483+1991.24+0.78+8.76933-157-434821-9980.4×125×25×0.81.25×（8+10）9123-（123+8.8）1.24×8.3+8.3×1.769999×100114.8×6.3-6.3×6.5＋8.3×3.732×125×251035-9985076＋993008＋449428×25×4328-1

3、89-2843.2-（3.2-1.2825×2×1.25×4×5×884×0.25＋16÷46.3+0.87+3.7+8.16=18.75-0.43-4.57=7.2+2.8=0.36+0.64=8-2.5=1.83+2.7=13.8+9.9=3.8+4.29+2.1+4.2=8.3-2.63=32.8+5.6+7.2=3.5+7.6=12-6.2-3.8=1.7+0.43+3.3=5.4-2.5-1.4=０.９９＋１.８＝２.５６－０.３７＝３.９＋２.０３＝２.１４－０.９＝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

4、×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＝8÷10=10-1.8-7.2=0.43+3.57=2.5×4×12=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=1.2×0.5-0.40.7÷0.01=2.5×0.4=12－3.9=1.25×8÷1.

5、25=6.6÷0.66=5.37×0+4.63=3.9＋2.03＝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＝4.2÷0.1＝72.8÷0.8＝8.4÷4.2＝13.8＋9.9＝2.4×2.5＝0.05×0.8＝2.56－0.37＝1.25×0.8×0.5＝12×2.5＝1.23×3＝

6、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=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）7.15×2290.75

7、÷3.33.68×0.2516.9÷0.131.55÷3.93.7×0.01613.76×0.8=5.2×0.68.4×1.36.4×0.54.48×0.45.25×535.4×4.20.042×0.540.76×0.320.25×0.0462.52×3.41.08×250.12×0.5×0.16＝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