题目内容

计算下面各题,能简便计算的用简便方法计算。
(1)7.4×9.8-14.5 (2)13.4+5.62+17.6+4.38 (3)6.73×4.8+5.2×6.73
(4)8.4÷0.6+8.4÷0.4 (5)(9.6+1.48÷3.7)÷8 (6)5.8÷[4×(1.34-0.14)]
         

(1)7.4×9.8-14.5
      =7.4×(10-0.2)-14.5
      =7.4×10-7.4×0.2-14.5
      =74-1.48-14.5
      =58.02

(3)13.4+5.62+17.6+4.38
     =(13.4+17.6)+(5.62+4.38)
     =31+10
     =41
 
 
(3)6.73×4.8+5.2×6.73
      =6.73×(4.8+5.2)
      =6.73×10
      =67.3
 
 
(4)8.4÷0.6+8.4÷0.4
      =84÷6+84÷4
      =14+21
      =35
(5)(9.6+1.48÷3.7)÷8
        =9.6÷8+1.48÷3.7÷8
        =1.2+0.05
        =1.25

(6)5.8÷[4×(1.34﹣0.14)]
=5.8÷(4×1.2)
=5.8÷4.8
=1.2

 

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