Ответ:

  1. \(704\cdot69+1424=48576+1424=50000\);
  2. \(412\cdot42-7304=17304-7304=10000\);
  3. \((938-543)\cdot34=395\cdot34=13430\);
  4. \(85\cdot(870-567)=85\cdot303=25755\);
  5. \((294+16)\cdot(348-279)=310\cdot69=21390\);
  6. \(294+16\cdot348-279=294+5568-279=5583\);
  7. \((294+16)\cdot348-279=310\cdot348-279=107601\);
  8. \(294+16\cdot(348-279)=294+16\cdot69=1398\).