27.6*9.9和3.6-72*0.025的简便算法
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27.6*9.9和3.6-72*0.025的简便算法
![27.6*9.9和3.6-72*0.025的简便算法](/uploads/image/z/2913996-12-6.jpg?t=27.6%2A9.9%E5%92%8C3.6-72%2A0.025%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95)
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27.6*9.9=27.6*(10-0.1)=27.6*10-27.6*0.1=276-2.76=273.24
3.6-72*0.025=3.6*1-3.6*20*0.025=3.6*1-3.6*20*0.025=3.6*1-3.6*0.5=3.6*(1-0.5)=3.6*0.5=1.8
27.6*9.9=27.6*(10-0.1)=27.6*10-27.6*0.1=276-2.76=273.24
3.6-72*0.025=3.6*1-3.6*20*0.025=3.6*1-3.6*20*0.025=3.6*1-3.6*0.5=3.6*(1-0.5)=3.6*0.5=1.8