1) 0,5 + 1/4 = 5/10 + 1/4 = 1/2 + 1/4 = 2/4 + 1/4 = 3/4
2) 3/4 * 1,8 = 3/4 * 1 8/10 = 3/4 * 1 4/5 = 3/4 * 9/5 = 27/20
3) 7,6 - 7 2/5 = 7 6/10 - 7 2/5 = 7 3/5 - 7 2/5 = 1/5
4) 1/5 : 2/3 = 1/5 * 3/2 = 3/10
5) 27/20 : 3/10 = 27/20 * 10/3 =
270/60 = 4 30/60 = 4 1/2
Ответ: 4 1/2