Ответ:

  1. \(753\cdot44=753\cdot(40+4)=30\,120+3\,012=33\,132\).

  2. \(802\cdot51=802\cdot(50+1)=40\,100+802=40\,902\).

  3. \(265\cdot110=265\cdot11\cdot10=2\,915\cdot10=29\,150\).

  4. \(4\,498\cdot69=4\,498\cdot(70-1)=314\,860-4\,498=310\,362\).

  5. \(3\,003\cdot69=3\,003\cdot(70-1)=210\,210-3\,003=207\,207\).

Ответ: 1) 33 132; 2) 40 902; 3) 29 150; 4) 310 362; 5) 207 207.