DAU COROANA repede ca e test
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Răspuns:
[tex]8x ^{7} + 12x ^{3} = 4 x ^{3} \times (2x ^{4} + 3)[/tex]
[tex]x ^{2} - 49 = x ^{2} - 7 ^{2} = (x - 7) \times (x + 7)[/tex]