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9.98*9.9用简便方法怎么算?

9.98×9.9 =9.98×(10-0.1) =9.98×10-9.98×0.1 =99.8-0.998 =98.802

9.98×9.9=9.98×(10-0.1)=9.98×10-9.98×0.1=99.8-0.998=98.802 一、简便方法归类: 1、带符号搬家法(根据:加法交换律和乘法交换率) 当一个计算题只有同一级运算(只有乘除或只有加减运算)又没有括号时,我们可以“带 符号搬家”。 (a+b+c=a+c+b...

9.98×9.9 =9.98×(10-0.1) =9.98×10-9.98×0.1 =99.8-0.998 =98.802 满意请采纳。

9.98×9.9 =9.98×10-0.1 =99.8-0.998 =98.802

9.98x9.9 =9.98x(10-0.1) =99.8-0.998 =98.802

(99+1)+(98+2)+(9+1)-1-2-1 =100+100+10-4 =100+100+(10-4) =100+100+6 =200+6 =206

9.98-9.98*0.1 =9.98-0.98-0.018 =9-0.018 =8.982

10.1*8-0.8 =10.1*8-0.1*8 =(10.1-0.1)*8 =10*8 =80

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