Giúp tớ với ạ sossss tớ đang cần gấp

1) (2x + y - 1)^2 + (2x - 1)^2 = (4x^2 + 4xy - 4x + y^2 - 2y + 1) + (4x^2 - 4x + 1) = 8x^2 + 4xy + y^2 - 2y + 2.

2) -(x + 1)^2 - (x - 1)^2 = -[(x^2 + 2x + 1) + (x^2 - 2x + 1)] = -2x^2 - 2.

3) (x + 2y)^2 - (x - 2y)^2 = [(x^2 + 4xy + 4y^2) - (x^2 - 4xy + 4y^2)] = 8xy.

4) (x + y)^2 + (x - y)^2 = [(x^2 + 2xy + y^2) + (x^2 - 2xy + y^2)] = 2x^2 + 2y^2.

5) (x + 5)^2 - (x - 3)^2 = [(x^2 + 10x + 25) - (x^2 - 6x + 9)] = 16x + 16.

6) (3x - 2)^2 - (3x - 1)^2 = [(9x^2 - 12x + 4) - (9x^2 - 6x + 1)] = -6x + 3.

7) -(x - 4y)^3 - (x + 4y)^3 = -[x^3 - 12xy^2 + 48y^3 + x^3 + 12xy^2 + 48y^3] = -2x^3 - 96y^3.

8) -(-2x + 3)^3 - (-5x - 3)^3 = -[(-2x)^3 + 3(-2x)^2(3) + (-5x)^3 + 3(-5x)^2(-3)] = -[8x^3 - 36x + 125x^3 + 45] = -133x^3 + 36x + 45.

9) -(-2x + 3)^3 - (-5x - 3)^3 = [8x^3 - 36x + 27 + 125x^3 + 45] = 133x^3 - 36x - 27.