Ответ:

  1. \[8am-16an+12a=4a(2m-4n+3).\]
  2. \[-35mp+21mn-14mk=7m(-5p+3n-2k).\]
  3. \[0.2abc+0.6abd-1.2abm=0.2ab(c+3d-6m).\]

Ответ: а) \(4a(2m-4n+3)\); б) \(7m(-5p+3n-2k)\); в) \(0.2ab(c+3d-6m)\).