1) (1,3a - 4) - (6 + 2,7a) = 1,3a - 4 - 6 - 2,7a = (1,3a - 2,7a) + (-4 - 6) = -1,4a - 10
2) 2,5(-2x + 4y - z) = 2,5 -2x + 2,5 4y - 2,5 * z = -5x + 10y - 2,5z
1) (1,3a - 4) - (6 + 2,7a) = 1,3a - 4 - 6 - 2,7a = (1,3a - 2,7a) + (-4 - 6) = -1,4a - 10
2) 2,5(-2x + 4y - z) = 2,5 -2x + 2,5 4y - 2,5 * z = -5x + 10y - 2,5z