a) (a + b) - (2a - b) - (a - 2b) = a + b - 2a + b - a + 2b = 4b - 2a
b) (3x - y + 1) - (x + y) + (y - x) = 3x - y + 1 - x - y + y - x = x - y + 1
c) -(kx + ny) - (3kx + 2ny) + (5kx - 3ny) = -kx - ny - 3kx - 2ny + 5kx - 3ny =
kx - 6ny
d) (2ab + a + 3) - (3ab - a + 3) = 2ab + a + 3 - 3ab + a - 3 = -ab +2a
e) (4 - 3x) - (x + 0,1
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a) (a + b) - (2a - b) - (a - 2b) = a + b - 2a + b - a + 2b = 4b - 2a
b) (3x - y + 1) - (x + y) + (y - x) = 3x - y + 1 - x - y + y - x = x - y + 1
c) -(kx + ny) - (3kx + 2ny) + (5kx - 3ny) = -kx - ny - 3kx - 2ny + 5kx - 3ny =
kx - 6ny
d) (2ab + a + 3) - (3ab - a + 3) = 2ab + a + 3 - 3ab + a - 3 = -ab +2a
e) (4 - 3x) - (x + 0,1