2.
а) 17/30 и 21/40, 17/30 = 68/120, 21/40 = 63/120
68/120 > 63/120, значит 17/30 > 21/40
б) 8,702603 > 8,7020603
в) 93/96 и 23/24, 23/24 = 92/96
93/96 > 92/96, значит 93/96 > 23/24
г) -11,02 = -11,0200
3.
а) к1 = 19/24, к2 = 20/24
б) n1 = 5/12, n2 = 6/12, n3 = 7/12
4.
11/18 = 0,6(1)