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Cel mai inteligent răspuns!
2014-04-27T16:26:35+03:00
(3x-y)²-(2x+3y)²
a²-b²=(a-b)(a+b)
la tine a²=3x-y si b=2x+3y
(3x-y-2x-3y)(3x-y+2x+3y)=(x-4y)(5x+2y)
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2014-04-27T16:37:37+03:00