Question

Помогите пожалуйста 1 и 2 номер

Answer 1

№ 1.
1/2 + 7/8 = 4/8 + 7/8 = 11/8 = 1 3/8
8/9 - 5/7 = 56/63 - 45/63 = 11/63
13/20 - 4/15 = 39/60 - 16/60 = 23/60
5/9 + 11/36 = 20/36 + 11/36 = 31/35
1/4 + 3/7 = 7/28 + 12/28 = 19/28
14/15 - 11/12 = 56/60 - 55/60 = 1/60
№ 2.
19/20 и 7/8 = 38/40 и 35/40, 38 > 35, значит 19/20 > 7/8
11/12 и 9/10 = 55/60 и 54/60, 55 > 54, значит 11/12 > 9/10
0,4 и 3/7 = 4/10 и 3/7 = 28/70 и 30/70, 28 < 30, значит 0,4 > 3/7