3⁷-3⁵+3³ = 3³(3⁴-3²+1) = 9(3⁴-3²+1) – кратно трём.
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3⁷-3⁵+3³ = 3³(3⁴-3²+1) = 9(3⁴-3²+1) – кратно трём.