6. 7.3-7 3.5+3 2.7-5 37+6+14 5 + 25 +18 48 + 7 + 13 2.8 2.9 9.2 15:5 18:9 21:7

Решения:

* \(7 \cdot 3 - 7 = 21 - 7 = 14\)
* \(3 \cdot 5 + 3 = 15 + 3 = 18\)
* \(2 \cdot 7 - 5 = 14 - 5 = 9\)
* (37 + 6 + 14 = 43 + 14 = 57)
* (5 + 25 + 18 = 30 + 18 = 48)
* (48 + 7 + 13 = 55 + 13 = 68)
* \(2 \cdot 8 = 16\)
* \(2 \cdot 9 = 18\)
* \(9 \cdot 2 = 18\)
* (15 : 5 = 3)
* (18 : 9 = 2)
* (21 : 7 = 3)