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(x+2)²+2(2x-3)(2x+3)-(3x-2)²

Răspuns :

=x^2+4x+4+2(4x^2-9)-(9x^2-12x+4)=
=x^2+4x+4+8x^2-18- 9x^2+12x-4=
=9x^2-9x^2+16x+4-4-18
=16x-18