3.4+9.6-(27+9): 4.5= (5.6-3.4-48:6).7-13=

$$3 \cdot 4 + 9 \cdot 6 - (27 + 9) : 4 \cdot 5 = 12 + 54 - 36 : 4 \cdot 5 = 12 + 54 - 9 \cdot 5 = 12 + 54 - 45 = 21$$

$$(5 \cdot 6 - 3 \cdot 4 - 48 : 6) \cdot 7 - 13 = (30 - 12 - 8) \cdot 7 - 13 = (30 - 20) \cdot 7 - 13 = 10 \cdot 7 - 13 = 70 - 13 = 57$$

Ответ: 21; 57