4/15+3/14÷1/6+5/7[7/12-(3/4÷9)]×5/6

4/15+3/14÷1/6+5/7[7/12-(3/4÷9)]×5/6
4/15+3/14÷1/6+5/7
[7/12-(3/4÷9)]×5/6

4/15+3/14÷1/6+5/7[7/12-(3/4÷9)]×5/6
4/15+3/14÷1/6+5/7
=4/15+9/7+5/7
=4/15+2
=2又4/15
[7/12-(3/4÷9)]×5/6
=(7/12-1/12)×5/6
=1/2×5/6
=5/12

1.0166666666667
0.41666666666667

1、原式=4/15+3/14*6+5/7
=4/15+2
=34/15
2、原式=（7/12-1/12）*5/6
=1/2*5/6
=5/12