Помогите решить дроби пж

27/4 : 9 = 27/4 * 1/9 = 3/4; 13/7 : 7 = 13/7 * 1/7 = 13/49; 1 : 10/3 = 1 * 3/10 = 3/10; 36 : 7/3 = 36 * 3/7 = 108/7 = 7 3/7; 100 : 1/10 = 100 * 10/1 = 1000; 1 2/5 : 7/10 = 7/5 * 10/7 = 2; 5/9 : 1 2/9 = 5/9 * 9/11 = 5/11; 1 3/4 : 2 5/8 = 7/4 * 8/21 = 2/3.