https://mathweb.ru/umnojenie-stolbikom.html?id=25586

Умножить 9999999999999999999999999999999999999999999999999999999999 на 999999999999999999999999999999999999999999999999999999999 = 9999999999999999999999999999999999999999999999999999999989000000000000000000000000000000000000000000000000000000001 Столбиком

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Решение:
x9999999999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999999999
+89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
89999999999999999999999999999999999999999999999999999999991
9999999999999999999999999999999999999999999999999999999989000000000000000000000000000000000000000000000000000000001
Ответ: 9999999999999999999999999999999999999999999999999999999999×999999999999999999999999999999999999999999999999999999999 = 9999999999999999999999999999999999999999999999999999999989000000000000000000000000000000000000000000000000000000001