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c) 10 - 2 • (3 1/5 - 2 1/4 • 1/3) = 10 - 2*(16/5 - 9/4 * 1/3) = 10 - 2*(16/5 - 3/4) = = 10 - 2 * (64/20 - 15/20) = 10 - 2 * 49/20 = 10 - 49/10 = 10 - 4,9 = 5,1
d) (7/3 - 5/12 + 1 1/2) : (2 3/4 - 5/6)=(28/12 - 5/12 + 18/12) : ( 11/4 - 5/6) = = 41/12 : (33/12 - 10/12) = 41/12 : 23/12 = 41/12 * 12/23 = 41/23 = 1 18/23