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81 = 2a(do potęgi2) + 4a(do potęgi2) = 6a(do potęgi2)
a(do potęgi2)= 81 : 6 = 9 : √6
2a = 2 * 9/√6=¹("18")/√("6")
Pb : 4 * 9/√("6")× * ("18") /√("6") = 108cm(do potęgi2)