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a) - 1/2 * (- 2/3) ÷ 5/6 = 2/6 * 6/5 = 2/5...Rpta
b) √1/9 *9 + 1/4 ÷ 3/2 = 1/3 * 9 + 1/4 * 2/3 = 3 + 1/6 = 19/6......Rpta
c) 9/4 * 5/9 + 4/6 - (-1/4) = 5/4 + 4/6 + 1/4 = 26/12 = 13/6.......Rpta