Question

Плиз 3)7,4(a+b) + 0,5(a-b)
4)3(2a+1 + 2(3a+1)

Answer 1

3) 7,4а+7,4б +0,5а-0,5б = 7,4а+0,5а=7,9а ; 7,4б-0,5б= 6,9б = 7,9а+6,9б;
4)6а+3+6а+2= 12а+5