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


Răspuns :

(3x+1)2-(x+3)2 = 6x+2-2x-6 = 4x-4
(3x+5)2-(x+1)2= 6x+10-2x-2 = 4x + 8