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b) 6 - 3 7/9 = 5 9/9 - 3 7/9 = 2 2/9
c) ( 1 1/3 - 1,5) - 2,4 - 0,1 = (1 1/3 - 1 1/2) - 2 4/10 - 1/10 = (8/6 - 9/6) - 2 5/10 =
= - 1/6 - 2 1/2 =- 1/6 - 2 3/6 = - 2 4/6 = - 2 2/3
d) 2 1/4 * 1 1/3 + 22,4 : (-4) = 9/4 * 4/3 - 5,6 = 3 - 5,6 = - 2,6