Calculați până ajungeți la forma cea mai simplă: a) 3x(x+2) -5(x+2) b)14x(3x-1)-7(3x-1) c)4(2x+4)-x(2x+3) d)3(5x-2)^2+(3x+2)(5x-2) e) 2x(x+3) +(x+3)^2 f)(x+2)^2+(x+3)^2-(3x+1)(3x-1) g)(3x-2)^2+(5x-2)(5x+2) h)(5x+3)(5x-3)-(x-1)^2-(2x-1)^2​