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(5x-7)·[2(x+2)+3(x+1)]-(4x-3)·[3(x+3)+x-6]=?

Răspuns :

(5x-7)*[2x+4+3x+3]-(4x-3)*[3x+9+x-6]=
=(5x-7)*(5x+7)-(4x-3)*(4x+3)=
=25x^2-49-16x^2-9=
=9x^2-58