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1/3^ = 1/9
1/9 : 9 = 1/9 * 1/9 = 1/81
b) pierwiastek ze 169/144 = 13/2
pierwiastek z 16/81 = 4/9
13/12 * 9/4 = 117/48 = 2 21/48 = 2 7/16