Найдите произведение 6/11 *3/5 - б 7/8 *4/21 в -1 целая 2/5 *3целых4/7 г 1целая 1/3*2целых 1/4 д 12*3целых1/6

а) 6/11 * 3/5 = 6 * 3/11 * 5 = 18/55;

б) 7/8 * 4/21 = 7 * 4/8 * 21 = 1 * 1/2 * 3 = 1/6;

в) 1 2/5 * 3 4/7 = 7/5 * 25/7 = 7 * 25/5 * 7 = 1 * 5/1 * 1 = 5/1 = 5; 

г) 1 1/3 * 2 1/4 = 4/3 * 9/4 = 4 * 9/3 * 4 = 1 * 3/1 * 1 = 3/1 = 3;

д) 12 * 3 1/6 = 12 * 19/6 = 2 * 19/1 = 38/1 = 38;