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7/1十7/5除以6/5

1/7+5/7÷6/7+5/12 =1/7+5/7x7/6+5/12 =1/7+5/6+5/12 =12/84+70/84+35/84 =117/84 =39/28

这样

1÷5/6-1÷6/7=1÷(5/6-6/7)=1÷(-1/42)=42

5/6÷(7/8÷1/5) =5/6÷35/8 =4/21

一又2/7除以(6/5) =9/7÷6/5 =15/14 -------------------------------

6/5*6/7-1/5÷7/6 =6/5*6/7-1/5*6/7 =(6/5-1/5)*6/7 =1*6/7 =6/7

4/7÷6/7-1/5 =4/7×7/6-1/5 =2/3-1/5 =10/15-3/15 =7/15

2/5÷6/7+(1-7/15) =2/5×7/6+8/15 =7/15+8/15 =1

(1/4+1/5×5/26)÷10/7 =(1/4+1/26)x7/10 =(13/52+2/52)x7/10 =15/52x7/10 =21/104

第一题,相当于3/5*10*1/6约分可得答案为1,第二题,先算5/6*/5=1/3,则为7/8除1/3即为乘三答案21/8

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