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(4 1/6)do potegi -2 : (5/6)do potegi -2 * 5 do potegi 2 =
= (25/6)^(-2) : (6/5)² * 5² =
= (25/6 * 6/5 * 1/5)^(-2) = (5 * 1/5)^(-2) = 1