计算:ab分之(a-b)-ac分之(a-c)+bc分之(b-c)

问题描述:

计算:ab分之(a-b)-ac分之(a-c)+bc分之(b-c)

=[(a-b)c-(a-c)b+(b-c)a]/abc
=(ac-bc-ab+bc+ab-ac)/abc
=0