Tính

A,- (x - y)² - (2x + y)²

B, (x + 2y)² + (x - 2y)²

C,(3x - 2)² - (3x - 1)²

D,(-2x + 3)² - (5x -3)²

E,- (-2x + 3)² - (5x - 3)²

F,-(2x+7)^2 +(2x-3)^2

G,-(2x-y)^2+(2x-3)^2

I,(x+2)^2-(x-3)(x+1)

H,(x+1)^2+(x-2)(x+2)-4x