1) 3(a-b)-2(a+b) = 3a - 3b - 2a - 2b = 3a - 2a - 3b - 2b = a - 5b.
2) 4(x+y)+5(2x-y) = 4x + 4y + 10x - 5y = 4x + 10x + 4y - 5y = 14x - y.
3) 2,4(c-3b)-1,3(2c-d) = 2,4c - 2,43b - 1,32c + 1,3d = 2,4c - 7,2b - 2,6c + 1,3d = 2,4c - 2,6c - 7,2b + 1,3d = -0,2c - 7,2b + 1,3d.
1) 3(a-b)-2(a+b) = 3a - 3b - 2a - 2b = 3a - 2a - 3b - 2b = a - 5b.
2) 4(x+y)+5(2x-y) = 4x + 4y + 10x - 5y = 4x + 10x + 4y - 5y = 14x - y.
3) 2,4(c-3b)-1,3(2c-d) = 2,4c - 2,43b - 1,32c + 1,3d = 2,4c - 7,2b - 2,6c + 1,3d = 2,4c - 2,6c - 7,2b + 1,3d = -0,2c - 7,2b + 1,3d.