X=5^10+6•5^9+9•5^8
X = 5^8 × (5^2 + 6 × 5^1 + 9 )
X = 5^8 × (25 + 30 + 9)
X = 5^8 × 64
X = (5^4)^2 × 8^2
X = (5^4 × 8)^2 patrat perfect
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Poate ramane asa sau sa faci si calculele :
5^4 = 625
625 × 8 = 5000
X = 5000^2 p.p
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