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10100 in baza x=90 in baza 10​

Răspuns :

10100 in baza x=90 in baza 10​

1·x⁴+1·x²=90

x²(x²+1)=9·(9+1)

=> x=3

verificare:10100(3)=3⁴+3²=90 (A)