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25. Any number that has 9 as a factor also has 3 as a factor. Why is this?

Ask by Pope Mullins. in the United States
Jan 23,2025

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Answer

Любое число, которое делится на 9, также делится на 3, потому что 9 равно 3 × 3.

Solution

Любое число, которое делится на 9, также делится на 3, потому что 9 само делится на 3. Разберём подробнее: - Число 9 можно представить как произведение 3 × 3. - Если число N делится на 9, то существует целое число k такое, что N = 9 × k. - Подставляя значение 9, получаем N = 3 × 3 × k. - Это означает, что N делится на 3 (поскольку в разложении присутствует множитель 3). Таким образом, наличие 9 как делителя числа гарантирует, что 3 также является его делителем.

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Bonus Knowledge

The reason that any number with 9 as a factor also has 3 as a factor boils down to the fundamental principles of numbers. Since 9 can be expressed as 3 multiplied by itself (3 x 3), it inherently contains 3 within its composition. So, if a number is divisible by 9, it is also divisible by both of its prime factors—3 in this case. To look at it another way, if you take any number divisible by 9, for example, 27, you find that 27 divided by 9 equals 3. This division reinforces the idea that 3 fits perfectly into any number that can be evenly divided by 9. It’s like a little number party where 9 brings 3 along!

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