Aide moi stp je n'y arrive pas

Bonjour,

[tex] A = x(5x-3)\\ B = x(7x^2+1) \\ C = (2x+1)(3x-4+5) = (2x+1)(3x+1) \\D = (x-2)(7-(4x+1) = (x-2)(6-4x) = (2-2)\times2(3-2x)\\ E = (2x-1+1)(x-3)=2x\times(x-3)\\\\ F = (x-1)(x+1+2) = (x-1)(x+1)\\ G = (2x+5)(2x+5-3) = (2x+5)(2x+2) = (2x+5)\times2(x+1)\\ H = (3x-1)(3x-1-1)=(3x-1)(3x-2)\\ I = (x+3)(2(x+3)+x-2) = (x+3)(3x+4)\\ J = (5x+1)(5x+1-(x-3)) = (5x+1)(4x+4)\\ = (5x+1)\times4(x+1)[/tex]

Bonne journée.