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(2x-3y)( 2x+3y)+(x+3y+1)2


Răspuns :

(2x-3y)( 2x+3y)+(x+3y+1)2=
(2x)²-(3y)²+2x+6y+2=
4x²-9y²+2x+6y+2=2x(2x+1)-9y²+6y+2