Упростите выражение: 1) -6a 10a-9а 2) 2,3b-8b+1,7b 3) -1/2c-1/3c+5/6c 4) -3a-5a-3a

Упростим:

1) -6 * a + 10 * a - 9 * а = a * (-6 + 10 - 9) = a * (4 - 9) = a * (-50 = -5 * a; 

2) 2,3 * b - 8 * b + 1,7 * b = b * (2.3 - 8 + 1.7) = b * (4 - 8) = -4 * b; 

3) -1/2 * c - 1/3 * c + 5/6 * c = c * (5/6 - 1/2 - 1/3) =  c * (5/6 - 3/6 - 2/6) = c * 0/6 = c * 0 = 0; 

4) -3 * a - 5 * a - 3 * a = a * (-3 - 5 - 3) = a * (-6 - 5) = -11 * a; 

5) -3,8 * b + 9 * b - 7 * b = b * (-3.8 + 9 - 7) = b * (-3.8 + 2) = -1.8 * b.