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aduceti la forma cea mai simpla expresia (x+2) la a 2 a -(x-2)x(x+2)-x *(2x-1)

Răspuns :

(x+2)²-(x-2)(x+2)-x(2x-1)=
x²+4x+4-x²+4-2x²+x=
-2x²+5x+8