Question

Упростите выражение:

Answer 1

2/7(1,4а-3 1/2b)-1,2(5/6а-0,5b)=2/7(7/5а-7/2b)-6/5*5/6а+6/5*1/2b=
2/7*7/5а -2/7*7/2b - а+3/5b = 2/5а-b-а+3/5b=-3/5а-2/5b=-(3/5а+2/5b)