а) (7/18 - 5/24 + 4/9) 72 = (4/24 - 5/24 + 8/24) 72 = 7/24 72 = 7 3 = 21.
б) 7/8 2 4/7 + 5/8 2 4/7 = 7/8 (18/7) + 5/8 (18/7) = 18/8 + 15/8 = 33/8 = 4 1/8.
в) 3/20 1 2/3 + 1 2/3 0,075 = 3/20 5/3 + 5/3 0,075 = 1/4 5 + 5/3 0,075 = 5/4 + 1/4 = 1 1/4.
г) 5 5/12 4 2/3 - 4 2/3 2 1/6 + 3,25 1/3 = (5 + 5/12) (4 + 2/3) - 4 (2 + 1/6) + 3,25 1/3 = (60/12 + 5/12) (12/3 + 2/3) - 4 (12/6 + 1/6) + 3,25/3 = (65/12) (14/3) - 4 (2) + 1,083 = 91 5/12 - 8 + 1,083 = 84,083.
а) (7/18 - 5/24 + 4/9) 72 = (4/24 - 5/24 + 8/24) 72 = 7/24 72 = 7 3 = 21.
б) 7/8 2 4/7 + 5/8 2 4/7 = 7/8 (18/7) + 5/8 (18/7) = 18/8 + 15/8 = 33/8 = 4 1/8.
в) 3/20 1 2/3 + 1 2/3 0,075 = 3/20 5/3 + 5/3 0,075 = 1/4 5 + 5/3 0,075 = 5/4 + 1/4 = 1 1/4.
г) 5 5/12 4 2/3 - 4 2/3 2 1/6 + 3,25 1/3 = (5 + 5/12) (4 + 2/3) - 4 (2 + 1/6) + 3,25 1/3 = (60/12 + 5/12) (12/3 + 2/3) - 4 (12/6 + 1/6) + 3,25/3 = (65/12) (14/3) - 4 (2) + 1,083 = 91 5/12 - 8 + 1,083 = 84,083.