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16.9×99.9简便计算?

解:依题意得,8.87*99.9=8.87*(100-0.1)=8.87*100-8.87*0.1=887-0.887=886.113即8.87*99.9=886.113

5.6*99.9=25.6*(100-0.1)=25.6*100-25.6*0

111.1*99.9=111.1*(100-0.1)=111.1*100-111.1*0.1=11110-11.11=11098.89如果帮到你,请记得采纳,O(∩_∩)O谢谢

16.9+3.1*1.2用简便方法计算16.9+3.1*1.2=16.9+3.1*1+3.1*0.2=16.9+3.1+0.62=20+0.62=20.62

解:原式=16.9-16.9+1.92 =0+1.92 =1.92

16.9-6.9*1.9=16.9-6.9x(2-0.1)=16.9-6.9x2-6.9x0.1=16.9-13.8-0.69=3.1-0.69=2.41-----------------------------------------------------------------------------------------

18.5x16.9一16.9一16.9x7.5=(18.5一1一7.5)x16.9=10x16.9=169

8.67*99.9=8.67*(100-0.1)=867-0.867=866.133 请参考

16.9*0.125+15.1*0.125 =0.125*(16.9+15.1) =1/8*32 =4

99.9*99.9=99.9^2=(100-0.1)^2=100^2-2*100*0.1+0.1^2=9980.01

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