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Exercitiile 5,6,7 de la testul 4. Dau 23 de puncte

Exercitiile 567 De La Testul 4 Dau 23 De Puncte class=

Răspuns :

5) a) 9⁷ = (3²)⁷ = (3⁷)² -este patrat perfect
4⁵= (2²)⁵ =(2⁵)² - e patrat perfect
b) 7⁴ (7+1) *7² = 7⁶ *8= (7²)³ * 2³=(7² * 2)³ - e cub perfect

6) 1+8+27=36
36=36 (adevarat)

7)
n=100 +2* 99*100 :2=100 + 99*100 = 100(1+99) = 100*100=100²
patrat perfect