Ответ:

  1. \(64{,}64-6{,}464-57{,}994=0{,}182\);
  2. \(63-0{,}99-62{,}01=0\);
  3. \(90{,}09-8{,}8-81{,}29=0\);
  4. \(7{,}54-5{,}74-1{,}8=0\);
  5. \(4{,}2-3{,}71-0{,}49=0\);
  6. \(6{,}2007-3{,}499-2{,}7017=0\).