题目内容

计算下面各题。(能简算的要简算)
(1)(9.3×-7.3)÷ (2)168.8÷(4.2×2-0.4)
(3)(-+)×12 (4)36.25-[(19.8-3.75)- 4.2]
(1)原式=(×-)×
                =(-)×
                =×
                =
(2)原式=168.8÷(8.4-0.4)
                =168.8÷8
                =21.1
 
 
 
(3)原式=×12-×12+×12
                =9-4+10
                =15
(4)原式=36.25-(19.8-3.75-4.2)
                =36.25-19.8+3.75+4.2
                =36.25+3.75-(19.8-4.2)
                =24.4
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