As a result of a road accident a 45-year-old male patient got multiple injuries, namely closed fractures of the right humerus and the left antebrachial bones with a displacement of bone fragments, a closed blunt abdominal injury. The patient was delivered to the emergency department 30 minutes after the injury. Objectively: the skin is pale. AP 90/20 mm Hg, there is pain and deformation at the fracture sites. Abdomen is tense, palpation causes severe pain, there is rebound tenderness (positive Blumberg’s sign). What is the treatment tactics of choice?