(1又3/4-7/8-7/12)除以(-7/8)+(-2/3)

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(1又3/4-7/8-7/12)除以(-7/8)+(-2/3)

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

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

原式=(7/4-7/8-7/12)除以(-7/8)+(-2/3)
=-2+1+2/3+(-2/3)
=-1