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3 1/4 x ( 2 1/4 - 1 1/2 : 6 ) = 3 1/4 x (2 1/4 - 3/2 x 1/6)= 3 1/4 x (2 1/4 - 3/12) = 3 1/4 x (2 3/12 - 3/12) = 3 1/4 x 2 = 6 2/4
ostatniego niestety nie dałam rady policzyć :(