https://mathweb.ru/umnojenie-stolbikom.html?id=25576

Умножить 900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 на 9999999999999999999999999999999999999999999999999999999999000 = 8999999999999999999999999999999999999999999999999999999999100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Столбиком

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Решение:
x900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
9999999999999999999999999999999999999999999999999999999999000
+000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8999999999999999999999999999999999999999999999999999999999100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Ответ: 900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000×9999999999999999999999999999999999999999999999999999999999000 = 8999999999999999999999999999999999999999999999999999999999100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000