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7/1十7/5除以6/5

7/1十7/5÷6/5 =7+7/5x5/6 =7+7/6 =8+1/6 ≈8+0.167 =8.167

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

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

1/7十5/6 =6/42+35/42 =41/42

5/6÷(7/8÷1/5) =5/6÷35/8 =4/21

题干不对

5/7×1/7+6/7÷7/5 =5/7×1/7+6/7×5/7 =5/7×(1/7+6/7) =5/7

7/6×括号1/6-1/3括号乘3/14÷(3/5) =7/6x(-1/3)x3/14x5/3 =-7/18x3/14x5/3 =-1/12x5/3 =-5/36

=13/5+7/2+6 =12又1/10

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

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