выполните умножение 2/3*9/14, 4/5*15/16, 3/7*8/21, 12/23*1, 17/39*0, 2/5:4/5, 3/7:9/14, 5/8:1/4, 3/17:2/51, 2/11:4/77, 3/4*2, 12/13:7/13, 33/34:1/34, 3/1*5 1/3, 64/76:16/19, 12/25*5/16, 12/19*1/24, 8/13*13/8, 23/72*72/23, 3/8:5/7, 5/16:6/8, 0:23/45, 3 1/4*4 10*5 2/5, 0: 2 1/7, 3 5/16*1, 2 17/18:1, 4 1/2:6 3/4, 1 51/93:1 5/31, 2 1/2*3 1/15, 4/9*3 3/4, 1 6/7*3 3/4, 1 6/7* 3 5/10, 8:4/7