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括号十二分之一加十二分之一减去十二分之七括号除...

解: 11/12-(1/3+7/12) =11/12-(4/12+7/12) =11/12-11/12 =0

解: 7/12-(1/8+5/12) =7/12-1/8-5/12 =14/24-3/24-10/24 =(14-3-10)/24 =1/24

5又三分之14 即 3分之29

(1/12-1/2-1/3)*24=-18

十二除以括号二分之一加三分之一减四分之一括号简便计算 解: 12÷(2分之1+3分之1-4分之1) =12÷(12分之6+12分之4-12分之3) =12÷12分之7 =12×7分之12 =7分之144

(5/12)÷[(1+1/2)÷(1/2)] =(5/12)÷[(3/2)÷(1/2)] =(5/12)÷[3/2*2] =5/12÷3 =5/36

十二分之一加十二分之七减十二分之五 =8/12-5/12 =3/12 =1/4

12×(1/4+1/6-1/3) =12×1/4+12×1/6-12×1/3 =3+2-4 =1

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