(2x+1)²-(x+6)(x-6)-3(x-2)²=
(x-5)²-(x-4)(x+4)+(x+1)²=
(3x-2)²-5(x-3)(x+3)-(2x+3)²=
(6x-5)²-(5x+4)(5x-4)-(4x+3)²=
(5x-2)²-(3x-4)(3x+4)-(4x+1)²=
(4x-3y)²-(2x-5y)(2x-5y)-(3x+y)(3x-y)=
(3x+y)²-(2x-5y)²-(x-2y)(x+2y)=
PLS!!!!!!! Este URGENT!​