Ответ:

  1. 286 × 1 = 286.

  2. 58 × 41 = 58 × (40 + 1) = 2320 + 58 = 2378.

  3. 5 × 62 = 5 × (60 + 2) = 300 + 10 = 310.

Ответ: 1) 286; 2) 2378; 3) 310.