1) -6a + 10a - 9a
2)a,3b - 8b + 1,7b
3)-1/2c - 1/3c + 5/6
4) -3a - 5a - 3a
ПОМОГИТЕ !!!!!!!!!!!!!

1) -6a + 10a - 9a  = 4a-9a = -5a.2) 0,3b - 8b + 1,7b = 0,3b + 1,7b - 8b = 2b - 8b = -6b.3) -¹/₂c - ¹/₃c + ⁵/₆с = -³/₆ - ²/₆ + ⁵/₆ = -⁵/₆ + ⁵/₆ = 0.4) -3a - 5a - 3a = -11а.