а) 5a + 4a;
б) 2x + 3x + 10;
в) 1,5a + a + 2,5a;
г) 6y + 8 + 6y;
д) 7m + m;
е)
5a + 4a = (5 + 4)a = 9a
2x + 3x + 10 = (2 + 3)x + 10 = 5x + 10
1,5a + a + 2,5a = (1,5 + 1 + 2,5)a = 5a
6y + 8 + 6y = 6y + 6y + 8 = (6 + 6)y + 8 = 12y + 8
7m + m = (7 + 1)m = 8m