(1又3/4-7/8-7/12)/(-7/8)

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(1又3/4-7/8-7/12)/(-7/8)
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(1又3/4-7/8-7/12)/(-7/8)
(1又3/4-7/8-7/12)/(-7/8)

(1又3/4-7/8-7/12)/(-7/8)
(1又3/4-7/8-7/12)/(-7/8)
=(7/4-7/8-7/12)×(-8/7)
=7/4×(-8/7)-7/8×(-8/7)-7/12×(-8/7)
=-2+1+2/3
=-1/3