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12.5 11.2的简便计算

12.5*11.2=12.5x8x1.4=100x1.4=140

12.5*11.2=12.5*(8+3.2)=12.5*(8+8*0.4)=12.5*8+12.5*8*0.4=100+40=140题外话:此题的简便运算用到了125*8=1000,类似的还有25*4=100

=8x12.5-0.1x12.5=100-1.25=98.75

=1567.5

7.2x12.5=9x0.8x12.5=9x10=90 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

125x11=125*(10+1)=1250+125=1375.

计算器12.5*88.888 = 1 111.1

12.5*80.8= 12.5*80+12.5*0.8= 1000+10= 1010

=12.5*0.8*5*0.2=10*1=10

12.4÷12.5 =(12.4*8)÷(12.5*8) =99.2÷100 =0.992 你好,本题已解答,如果满意 请点右上角“采纳答案”.

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