Подобные слагаемые: a) 1/12m-1/4m-1/3m; b) c-0,8c-1/5c-1/2c; c) 2/3a+3/8b-1/6a-1/4b; d) 0,2m-2/9-4m+5/9;

A)1/12m-3/12m-4/12m=-6/m=-0,5m
b)c-0,8c-0,2c-0,5c=-0,5c
c) 4/6a-1/6a+3/8b-2/8b=3/6a+1/8b=1/2a+1/8b
d) -3,8m+3/9=-3,8m+1/3