Ответ:

  1. \(12\cdot4+36:9=48+4=\)52.
  2. \(15\cdot3-(20+10)=45-30=\)15.
  3. \((50-26):(2\cdot3)=24:6=\)4.
  4. \((14+16)\cdot(10-4)=30\cdot6=\)180.