Question

упростите выражение срочно!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
2/7(1,4-31/2b)-1,2(5/6а-0,5b)

Answer 1

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