Ответ:

  1. 58 + x = 200; x = 200 − 58 = 142.
  2. x − 56 = 200; x = 200 + 56 = 256.
  3. 9600 : x = 96; x = 9600 : 96 = 100.
  4. 58 · x = 5800; x = 5800 : 58 = 100.
  5. 568 − x = 300; x = 568 − 300 = 268.

Ответ: x = 142; 256; 100; 100; 268.