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9.8×2.5怎样简便计算?

9.8*2.5=2.5*(10-0.2)=2.5*10-2.5*0.2=25-0.5=24.5

24.51000

9.8*2.5=(10-0.2)*2.5=10*2.5-0.2*2.5=25-5=20

问:简便计算9.8*2.5.答:2.5*10-2.5*0.2=25-0.5=24.5答题完毕,谢谢采纳

9.8-9.8+2.5+2.5=5这样做两个9.8抵消了,剩下两个2.5相加等于5

方法一:2.5*9.8=2.5*(10-0.2)=25-0.5=24.5方法二:2.5*9.8=10/4*9.8=98/4=24.5

因9.8=10-0.2 所以9.8*2.5=(10-0.2)*2.5=10*2.5-0.2*2.5=25-0.5=24.5

=2.5*10-2.5*0.2=25-0.5=24.5

2.5*9.8 =2.5x(10-0.2)=2.5x10-2.5x0.2=25-0.5=24.5

一.9.8*4.5=(10-0.2)*4.5=45-0.9=44.1 二.2.4*2.5*3.7=0.4*6*0.5*5*3.7=(0.4*0.5)*(6*5)*3.7=0.2*30*3.7=6*3.7=22.2三.12.5*9.8-4.9*5=4.9*(12.5*2-5)=4.9*20=98 希望能帮到你!

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