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2 1/3 = 7/3
szerokość- x
61/4 = 7/3x /*12
183 = 28x / :28
x = 183/28
Obw = 2*Dłg + 2*szer = 2*61/4 + 2*183/28 = 61/2 + 183/14 = 427/14 + 183/14 = 610/14 = 305/7