4900 35 2脱式计算

4900÷35÷2=4900÷(35*2)=4900÷70=70

35x148=35*2*74=70*74=5180

1.4*102-2*49=408-2*49=408-98=3102.25*(2+4)=25*2+25*4=50+100=1503.12*5+8=60+8=684.99*101 =99*(100+1)=99*100+99*1 =9900+99=99995.25*(78*4)=25*4*78=100*78=78006.(25+12)*4=25*4+12*4=100+48=1487.1.4+0.7+8.6 =(1.

35乘以后面的14 5 2 总和

(1)2.5*32*0.125=(2.5*4)*(8*0.125)=10*1=10 (2)3.5-7+6.5=3.5+6.5-7=3 (3)1.2*2.5+0.8*2.5=2.5(1.2+0.8)=25 (4)8.9*1.25-0.9*1.25=1.25(8.9-0.9)=10 (5)12.5*7.4*0.8=12.5*0.8*7.4=74 (6)6.5*9.5+6.5*0.5=6.5*(9.5+0.5)=6.5*10=65 (7)0.35*1.6+0.35

45.55-(6.82+15.55)34.52-17.87-12.236.43-(1.4-0.57)23.75-8.64-3.4617.83-9.5-7.83-0.55.38+88.2-2.38+1.827.38-5.34+2.62-4.66 21.63-(8.5+9.63) 7.5-2.45+7.5+2.450.9+0.99+0.999 5.09-(0.09+1.23) 9.36-(4.36-3.5)609-708+306-108+202-198+

脱式计算的简便算法35*22=35*2*11=70*11=770

35*40.2=35*(40+0.2) =35*40+35*0.2 =1400+7 =1407

脱式计算的简便算法35*22=35*2*11=70*11=770

1.45+15*6= 135 2.250÷5*8=400 3.6*5÷2*4=60 4.30*3+8=98 5.400÷4+20*5= 200 6.10+12÷3+20=34 7.(80÷20+80)÷4=21 8.70+(100-10*5)=120 9.360÷40+10= 19 10.40*20-200= 600 11.(80-25)*2= 110 12.70+45=115 13.90*2÷3= 60 14.16*6÷3=

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