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x=(radical 17+9)*(9-radical 17)

Răspuns :

x = (√17 + 9)(9 - √17)=9√17 - 17 + 81 - 9√17 = 81 - 17 = 64

x=(√17 + 9 ) · (9 -√17) = 9² - (√17)² = 81-17=64