计算过程如下：
（5/6-7/12×15/14）÷5/4
=（5/6-5/8）×4/5
=5/6×4/5-5/8×4/5
=2/3-1/2
=1/6
(5/6-7/12×15/14)÷5/4
=（5/6-5/8）÷5/4
=5/6÷5/4-5/8÷5/4
=5/6x4/5-5/8x4/5
=2/3-1/2
=4/6-3/6
=1/6
(5/6-7/12×15/14)÷5/4
=(5/6-7/12×15/14)×4/5
=5/6×4/5-5/8×4/5
=2/3-1/2
=（4-3）/6
=1/6
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