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7分之2除以〔4分之1加(6分之5减3分之2)〕脱式计算

7/4-3/4+1/2 =1+1/2 =1又1/2 ----------------------------------------------------------

6分之5-2分之1+3分之1 =6分之5-6分之3+6分之2 =6分之(5-3+2) =6分之4 =3分之2

2/3-3/4×4/6+1/3÷3/7 =2/3-1/2+7/9 =1/6+7/9 =17/18

5/7+3/11+1/4 这题没有简便算法 =220/308+84/308+77/308 =381/308

采纳给过程

6/7-3/14+5/21 =36/42-9/42+10/42 =1/42×(36-9+10) =1/42 ×37 =37/42

1/2+1/4-1/6=6/12+3/12-2/12=7/12

5/12+1/3-1/8 =5/12+4/12-1/8 =9/12-1/8 =18/24-3/24 =15/24 =5/8 求采纳

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