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3.48x9.9怎么简便

3.72*9.9=3.72*(10-0.1)=37.2-0.372=36.828

将27.8*9.9先看成27.8*10-27.8*0.1 整个计算公式就是2.78+27.8*10-27.8*0.1(2.78)=27.8*10=278

3.5x9.9=3.5x(10-0.1)=3.5x10-3.5x0.1=35-0.35=34.65

你的题目是少一个运算符号吧!2.78+27.8*9.9=2.78+(27.8/10)*(9.9*10)=2.78*(1+99)=278

4.62*9.9 =4.62*(10-0.1) =4.62*10-4.62*0.1 =46.2-0.462 45.738

3.8X9.9 =3.8X(10一0.1) =3.8X10一3.8X0.1 =38一0.38 =37.62

75.8乘以10减75.8乘以0.1

=2.5*(10-0.1)=2.5*10-2.5*0.1=25-0.25=24.75

3.7x9.9=3.7x(10-0.1)=3.7x10-3.7x0.1=37-0.37=36.63 如果复本题有什么不明白制可以追问,如果满意请点击“好评” 如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,zhidao谢谢.祝学习进步!

7.2x9.9 解:简便计算=7.2x(10-0.1)=7.2x10-7.2x0.1=72-0.72=71.28 祝学习进步.

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