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= 2 1/2 * (8/15 - 15/100) + 15/24 =
= 5/2 * (8/15 - 3/20) + 5/24 = 5/2 * (32/60 - 9/60) + 15/24 =
= 5/2 * 23/60 + 15/24 = 1/2 * 23/12 + 15/24 = 23/24 + 15/24 = 38/24 = 1 14/24 =
= 1 7/12
0,15*5/6-(0,7*3/7-4/5):(-1 1/2)=
= 15/100 * 5/6 - (7/10 * 3/7 - 4/5) : (-3/2) =
= 3/20 * 5/6 - (1/10 * 3 - 4/5) : (-3/2) = 1/4 * 1/2 - (3/10 - 8/10) * (-2/3) =
= 1/8 - (-5/10) * (-2/3) = 1/8 - 1/2 * 2/3 = 1/8 - 1/3 = 3/24 - 8/24 = -5/24