4/15+3/14÷1/6+5/7[7/12-(3/4÷9)]×5/6
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4/15+3/14÷1/6+5/7[7/12-(3/4÷9)]×5/64/15+3/14÷1/6+5/7[7/12-(3/4÷9)]×5/64/15+3/14÷1/6+5/7[7/12-(3/4÷9)
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