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(x-2)(x-3)-(x-1)(x-5)

Răspuns :

(x-2)(x-3)-(x-1)(x-5) = x²-2x-3x+6-x²+x+5x-5 =

=+6+x-5 =x+1 
=X la a2a -3x-2x+6- (x la a2a -5x-x+5)=x+1