1. Выполните умножение. 1) a) 2/5 * 3/7; б) 3/4 * 5/11; в) 2/9 * 11/7; г) 4/5 * 6/19; 2) a) 5/7 * 7/13; б) 4/9 * 1/4; в) 3/8 * 8/13; г) 3/7 * 7/11; 3) a) 6/26 * 15/17; б) 14/16 * 4/21; в) 24/25 * 7/36; г) 5/24 * 16/17

1) a) 2/5 * 3/7 = (2 * 3) / (5 * 7) = 6/35 б) 3/4 * 5/11 = (3 * 5) / (4 * 11) = 15/44 в) 2/9 * 11/7 = (2 * 11) / (9 * 7) = 22/63 г) 4/5 * 6/19 = (4 * 6) / (5 * 19) = 24/95 2) a) 5/7 * 7/13 = (5 * 7) / (7 * 13) = 35/91 = 5/13 б) 4/9 * 1/4 = (4 * 1) / (9 * 4) = 4/36 = 1/9 в) 3/8 * 8/13 = (3 * 8) / (8 * 13) = 24/104 = 3/13 г) 3/7 * 7/11 = (3 * 7) / (7 * 11) = 21/77 = 3/11 3) a) 6/26 * 15/17 = (6 * 15) / (26 * 17) = 90/442 = 45/221 б) 14/16 * 4/21 = (14 * 4) / (16 * 21) = 56/336 = 1/6 в) 24/25 * 7/36 = (24 * 7) / (25 * 36) = 168/900 = 14/75 г) 5/24 * 16/17 = (5 * 16) / (24 * 17) = 80/408 = 10/51 Ответ: 1) a) 6/35; б) 15/44; в) 22/63; г) 24/95 2) a) 5/13; б) 1/9; в) 3/13; г) 3/11 3) a) 45/221; б) 1/6; в) 14/75; г) 10/51