Ответ:

  1. \(53-(3\cdot9+4\cdot6)=53-(27+24)=2\).
  2. \(53-3\cdot9+4\cdot6=53-27+24=50\).
  3. \((53-3\cdot9+4)\cdot6=(53-27+4)\cdot6=30\cdot6=180\).
  4. \((53-3)\cdot9+4\cdot6=50\cdot9+24=474\).

Ответ: \(53-(3\cdot9+4\cdot6)=2\); \(53-3\cdot9+4\cdot6=50\); \((53-3\cdot9+4)\cdot6=180\); \((53-3)\cdot9+4\cdot6=474\).