5. 3 + 67 ◯ 67 + 3 9 + 28 ◯ 9 + 26 34- (18-9) ◯ 34-8 75- (14-6) ◯ 75-7

1. 3 + 67 67 + 3

   $$3 + 67 = 70$$

   $$67 + 3 = 70$$

   $$70 = 70$$

   3 + 67 = 67 + 3

2. 9 + 28 9 + 26

   $$9 + 28 = 37$$

   $$9 + 26 = 35$$

   $$37 > 35$$

   9 + 28 > 9 + 26

3. 34 - (18 - 9) 34 - 8

   $$34 - (18 - 9) = 34 - 9 = 25$$

   $$34 - 8 = 26$$

   $$25 < 26$$

   34- (18-9) < 34-8

4. 75- (14-6) 75-7

   $$75 - (14 - 6) = 75 - 8 = 67$$

   $$75 - 7 = 68$$

   $$67 < 68$$

   75- (14-6) < 75-7

Ответ: 3 + 67 = 67 + 3; 9 + 28 > 9 + 26; 34- (18-9) < 34-8; 75- (14-6) < 75-7