1) При $$x = 48$$:
$$3 \cdot \frac{1}{8} \cdot 48 + 2 \cdot 48 - (1 + 48 + 3 \cdot 48) = 3 \cdot 6 + 96 - (1 + 48 + 144) = 18 + 96 - (49 + 144) = 114 - 193 = -79$$
При $$x = 2\frac{2}{7} = \frac{16}{7}$$:
$$3 \cdot \frac{1}{8} \cdot \frac{16}{7} + 2 \cdot \frac{16}{7} - (1 + \frac{16}{7} + 3 \cdot \frac{16}{7}) = \frac{6}{7} + \frac{32}{7} - (1 + \frac{16}{7} + \frac{48}{7}) = \frac{38}{7} - (\frac{7}{7} + \frac{16}{7} + \frac{48}{7}) = \frac{38}{7} - \frac{71}{7} = -\frac{33}{7} = -4\frac{5}{7}$$
Ответ: -79; $$-4\frac{5}{7}$$