NEW YORK — A man slashed three NYPD officers with a machete as they were working to place him under arrest in an East Flatbush, Brooklyn apartment on Monday, according to police. The officers were called to the apartment on New York Avenue near Beverley Road around 3:20 p.m. for reports of a 40-year-old acting erratically, cops said. The officers spoke to the man’s family and were attempting to place the man under arrest when he attacked, slashing one of the cops in the right side of the head. As the other officers stepped in to subdue the emotionally disturbed man, one suffered a slash wound …