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b=(3^74+3^73+3^72):13

Răspuns :

b = ( 3 + 3³ + 3² ) ÷ 13

b = ( 3² + 3 + 1 ) 3² ÷ 13

b = ( 9 + 3 + 1 ) 3² ÷ 13

b = 13 3² ÷ 13

b = 1 3²

b = 3²