1. Вычислите: 1) 822 · 69; 2) 909 · 41; 3) 216 · 930; 4) 7 864 · 71; 5) 7 001 · 94.

1. \(822 \cdot 69 = 822 \cdot (70 - 1) = 57\,540 - 822 = 56\,718\).
2. \(909 \cdot 41 = 909 \cdot 40 + 909 = 36\,360 + 909 = 37\,269\).
3. \(216 \cdot 930 = 216 \cdot 93 \cdot 10 = 20\,088 \cdot 10 = 200\,880\).
4. \(7\,864 \cdot 71 = 7\,864 \cdot 70 + 7\,864 = 550\,480 + 7\,864 = 558\,344\).
5. \(7\,001 \cdot 94 = 7\,001 \cdot (100 - 6) = 700\,100 - 42\,006 = 658\,094\).

Ответ: 1) 56 718; 2) 37 269; 3) 200 880; 4) 558 344; 5) 658 094.