Владимирова Алла 1) 7/9 * 3/3 = 21/27; 2) 3/5 * 8/8 = 24/40; 3) 4/13 * 6/6 = 24/78; 5) 4/23 * 3/3 = 12/69; 4) 12/17 * 6/6 = 72/102; 6) 5/24 * 6/6 =30/144.
