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(×+1)²-3(×-2)²-2(2×+1)²=​

Răspuns :

x^2+2x+1-3(x^2-2•2•x+4)-2(4x^2+4x+1)=x^2+2x+1-3x^2+12x-12-8x^2-8x-2=-10x^2+6x-13