Ответ:

  1. 1111₂ = 1·2³ + 1·2² + 1·2¹ + 1·2⁰ = 8 + 4 + 2 + 1 = 15.

  2. 11111₂ = 1·2⁴ + 1·2³ + 1·2² + 1·2¹ + 1·2⁰ = 16 + 8 + 4 + 2 + 1 = 31.

  3. 1011001₂ = 1·2⁶ + 0·2⁵ + 1·2⁴ + 1·2³ + 0·2² + 0·2¹ + 1·2⁰ = 64 + 16 + 8 + 1 = 89.

  4. 10000000₂ = 1·2⁷ = 128.

Ответ: 1) 15; 2) 31; 3) 89; 4) 128.