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简便方法计算. 7/15+7/12+8/15%7/12 = = = 图片,快

7/15+8/15+(7/12-7/12) =1+0 =1

7/12-7/15加8/15简便运算 7/12-7/15加8/15 =7/12+(8/15-7/15) =7/12+1/15 =35/60+4/60 =39/60

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7/12×11+7/12 =7/12×(11+1) =7/12×12 =7 你好,本题已回答 如果满意请点击采纳答案

简便计算15.7×98.8+1.57×12 解: 15.7×98.8+1.57×12 =15.7×(98.8+1.2) =15.7×100 =1570

15-5÷12减去7/12等于? 15-5÷12-7/12 =15-5/12-7/12 =15-(5/12+7/12) =15-1 =14

12.5X7.2 =12.5X0.8X9 =10X9 =90

(8分之3+12分之7)×24 解:原式=8分之3×24+12分之7×24 =9+14 =23 即(8分之3+12分之7)×24=23

12分之7-20分之9+30分之11-42分之13+56分之15-72分之17 =1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9 =1/3-1/9 =2/9

7/15—(12/13—8/15)—1/13 =(7/15+8/15)-(12/13+1/13) =1-1 =0

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