Помогите пожалуйста. математика 5 класс

1) 11/12-5/12=6/12=1/22) 3.1/2-1.1/18=3.9/18-1.1/18=2.8/18=2.4/93) 2.4/9 + 3.8/9 = 5.12/9 = 6.3/9 = 6.1/34) 6.1/3 - 4.5/6 = 6.2/6 - 4.5/6 = 5.8/6 - 4.5/6 = 1.3/6=1.1/25) 1.2/7 : 1.1/2 = 9/7 : 3/2 = 9/7 * 2/3 = 6/76) 5.3/5 * 6/7 = 28/5 * 6/7 = 24/57) 4.2/5 : 24/5 = 22/5 : 24/5 = 22/5 * 5/24 = 22/24 = 11/12