1) \(712824 \times 537 = 712824 \times (500+30+7)\)
\(712824 \times 500=356412000\), \(712824 \times 30=21384720\), \(712824 \times 7=4989768\).
\(356412000+21384720+4989768=382596488\).
2) \(97748 \times 628 = 97748 \times (600+20+8)\)
\(97748 \times 600=58648800\), \(97748 \times 20=1954960\), \(97748 \times 8=781984\).
\(58648800+1954960+781984=61395744\).
Ответ: 1) 382596488; 2) 61395744.