道脱式计算答案过程.doc

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1、1.25×（8+10）=1.25×8+1.25×10=10+12.5=22.59123-（123+8.8）=9123-123-8.8=9000-8.8=8991.21.24×8.3+8.3×1.76=8.3×（1.24+1.76)=8.3×3=24.99999×1001=9999×（1000+1）=9999×1000+9999×1=1000899914.8×6.3-6.3×6.5＋8.3×3.7=（14.8-6.5）×6.3＋8.3×3.7=8.3×6.3+8.3×3.78.3×（6.3＋3.7）=8.3×10=831.24+0.78+

2、8.76=（1.24+8.76）+0.78=10+0.78=10.78933-157-43=933-（157+43）=933-200=7334821-998=4821-1000+2=3823I32×125×25=4×8×125×25=（4×25）×（8×125）=100×1000=1000009048÷268=（2600+2600+2600+1248）÷26=2600÷26+2600÷26+2600÷26+1248÷269=100+100+100+48=3482881÷43=（1290+1591）÷434=1290÷43+1591÷43

3、=30+373.2×42.3×3.75-12.5×0.423×16=3.2×42.3×3.75-1.25×42.3×1.6=42.3×(3.2×3.75-1.25×1.6)=42.3×(4×0.8×3.75-1.25×4×0.4)=42.3×(4×0.4×2×3.75-1.25×4×0.4)=42.3×(4x0.4x7.5-1.25x4x0.4)=42.3×[4×0.4×(7.5-1.25)]=42.3×[4×0.4×6.25]=42.3×(4×2.5)=42371.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0

4、.15=13.656.5×8+3.5×8-47=52+28-47=80-47(80-9.8)×5分之2-1.32=70.2X2/5-1.32=28.08-1.32=26.768×7分之4÷[1÷(3.2-2.95)]=8×4/7÷[1÷0.25]=8×4/7÷4=8/72700×（506－499）÷900=2700×7÷900=18900÷900=2133.02－（148.4－90.85）÷2.5=33.02－57.55÷2.5=33.02－23.02=10（1÷1－1）÷5.1=（1－1）÷5.1=0÷5.1=018.1＋（3－0.2

5、99÷0.23）×1=18.1＋1.7×1=18.1＋1.7=19.8[-18]+29+[-52]+60=19[-3]+[-2]+[-1]+0+1+2=-3[-301]+125+301+[-75]=50[-1]+[-1/2]+3/4+[-1/4]=-1[-7/2]+5/6+[-0.5]+4/5+19/6=1.25[-26.54]+[-6.14]+18.54+6.14=-81.125+[-17/5]+[-1/8]+[-0.6]=-30.45×2.5＝1.1250.8×1.25＝10.3×3.6＝1.080.3×0.3＝0.0910×0.0

6、7＝0.70.92×0.4＝0.3680.2×0.26＝0.0520.14×4＝0.560.02×0.1＝0.0021.2×0.3＝0.362.5×0.4＝12.4×5＝120.22×4＝0.883.25×0＝00.9－0.52＝0.383.99×1＝3.990×3.52＝012.5×8＝1008÷10=0.810-1.8-7.2=10.43+3.57=42.5×4×12=1440.9×0.8=0.727.5x-3x=4.5xa+3a+7a==11a1.05×100=1051÷0.5=20.96÷3=0.320.56×100=563.7

7、8×100=3784÷0.8=53.215×100=321.50.8×10=84.08×100=4081.1×0.2=0.220.6×0.8=0.483×0.9=2.72.5×0.4=10.16×5＝0.81.78＋2.2=3.981.2×0.5-0.4=0.20.7÷0.01=702.5×0.4=112－3.9=8.11.25×8÷1.25=86.6÷0.66=105.37×0+4.63=4.633.9＋2.03＝5.937.2＋2.8＝101.4×5=73/5+(-2/3)=9/15+(-10/15)=-(10/15-9/15)=-

8、1/151/2+(-2/3)+4/5+(-1/2)+(-1/3)=[1/2+(-1/2)]+[(-2/3)+(-1/3)]+4/5=0+(-1)+4/5=-1/513/17-3.5-6+2.5+6+4/17