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690x37 不用简便运算

690*37 =69*370 =(70-1)*370 =70*370 - 1*370 =25900 - 370 =25530

690*37=(700-10)*(40-3)=700*40-700*3-10*40+10*3=28000-2100-400+30=25900-400+30=25500+30=25530

99X37 =(100-1)X37 =100X37-1X37 =3700-37 =3663

103X37的简便计算103X37=37*(100+3)=37*100+37*3=3811

37x100-37x3

690X3333=690/3X3333X3=230X9999=230X(10000-1)=2300000-230=2299770

10*37-0.2*37这样简单

向左转|向右转

44/45*37=(1-1/45)*37=1*37-1/45*37=37-37/45=36又8/45

58x37-18x37=37*(58-18)=37*40=1480

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