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(x-1)(x+4)-(x-2)(x+2) =

Răspuns :

x²+4x-x-4-(x²+2x-2x-4)=
x²+3x-4-x²+4=
3x=0
x=0
x-4x-1x+4x-X la a 2 -  2 la a doua=2x + x la a doua! mul succes