Ответ:

  1. \(72\times86=72\times(80+6)=5760+432=6192\).

  2. \(1473\times51=1473\times(50+1)=73650+1473=75123\).

  3. \(280\times430=28\times43\times100=1204\times100=120400\).

  4. \(163\times574=163\times(500+70+4)=81500+11410+652=93562\).

  5. \(438\times190=438\times(200-10)=87600-4380=83220\).

  6. \(372\times208=372\times(200+8)=74400+2976=77376\).

Ответ: 6192; 75123; 120400; 93562; 83220; 77376.