Question

2)5а+3(2-а)
4)3(2а+1)+2(3а+1

Answer 1

2) =5а+6-3а=6+2а

4) =6а+3+6а+2=12а+5

Answer 2

2) 5а +6-3а=2а+6
4)3(2а+1)+2(3а+1)=6а+3+6а+2=12а+5

Answer 3

там во втором + 6