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ajutor (3×+5)(3×-5)+(5×+6)^2-(×+5)(×-5)​

Răspuns :

9x^2+(-15x)+15x-25+25x^2+2•5x•6+36-(x^2-5x+5x-25)=
9x^2-25+25x^2+60x+36-x^2+25=
33x^2+60x+36