Ответ:
- \(256\cdot459=256(400+50+9)=102400+12800+2304=117504\).
- \(2569\cdot456=2569(400+50+6)=1027600+128450+15414=1171464\).
- \(569\cdot598=569(600-2)=341400-1138=340262\).
- \(4589\cdot7956=4589(8000-44)=36712000-201916=36510084\).
- \(4596\cdot951=4596(1000-49)=4596000-225204=4370796\).
- \(456\cdot7896=7896(400+50+6)=3158400+394800+47376=3600576\).
- \(45\cdot98=45(100-2)=4500-90=4410\).
- \(99999\cdot7861=(100000-1)7861=786100000-7861=786092139\).
- \(256\cdot589=256(600-11)=153600-2816=150784\).
- \(7896\cdot12389=12389(8000-104)=99112000-1288456=97823544\).
- \(496\cdot596=(500-4)(600-4)=300000-2000-2400+16=295616\).
- \(753\cdot486=753(500-14)=376500-10542=365958\).
