Ответ:

  1. \(3(x+4)=3x+12\).
  2. \(5(a-2)=5a-10\).
  3. \(2(3y+1)=6y+2\).
  4. \(4(m-3)=4m-12\).
  5. \(6(2p-5)=12p-30\).

Ответ: \(3x+12;\ 5a-10;\ 6y+2;\ 4m-12;\ 12p-30\).