Question

mc分之-﹙a-b﹚等于-﹙ ﹚分之ac-bc

Answer 1

-(a-b)/mc,mc为分母,不等于零,则c不等于零

-(a-b)/mc=(a-b)/-mc=(a-b)*c/(-mc*c)=(ac-bc)/(-mc^2)

所以等于-(mc^2)分之ac-bc