1)a + (2b - 3c) = a + 2b - 3c 2)a - (2b - 3c) = - 2b+ 3c 3)a + (2b - 3c) = a - 2b - 4) - (a - 2b + 3c) = -a + 2b -
1)a + (2b - 3c) = a + 2b - 3c 2)a - (2b - 3c) = - 2b+ 3c 3)a + (2b - 3c) = a - 2b - 4) - (a - 2b + 3c) = -a + 2b -