211 1) 32x-1 + 32x = 108; 3) 2x+1 + 2x-1 + 2x = 28;

1. $$3^{2x-1} + 3^{2x} = 108$$

   $$3^{2x} \cdot (\frac{1}{3} + 1) = 108$$

   $$3^{2x} \cdot \frac{4}{3} = 108$$

   $$3^{2x} = 81$$

   $$3^{2x} = 3^4$$

   $$2x = 4$$

   $$x = 2$$

2. $$2^{x+1} + 2^{x-1} + 2^x = 28$$

   $$2^x \cdot (2 + \frac{1}{2} + 1) = 28$$

   $$2^x \cdot \frac{7}{2} = 28$$

   $$2^x = 8$$

   $$2^x = 2^3$$

   $$x = 3$$

Ответ: 2; 3