Question

Надо скинь написано число от 1 до 100 Миша подчеркнул сначала все числа делящиеся на 3 зачем все числа делишься и на 4 а затем все числа делящееся на 5 сколько чисел оказалось подчёркнуто ровно два раза

Answer 1

Признак делимости на 3.  Число делится на 3, если сумма его цифр делится на 3.        12 | 1+2 = 3

Признак делимости на 4. Число делится на 4, если две его последние цифры - нули или образуют число, которое делится на 4.

40

Признак делимости на 5. Число делится на 5, если его последняя цифра- ноль или 5.

подчёркнуто ровно два раза 16  чисел:

12 15 20 24 30 36 40 45 48 72 75 80 84 90 96 100

Answer 2

Solving the Problem Step by Step

To solve the problem, we need to find the numbers from 1 to 100 that are divisible by 3, then by 4, and finally by 5. Let's break it down step by step.

Step 1: Numbers Divisible by 3 - First, let's identify the numbers from 1 to 100 that are divisible by 3. - After that, we'll move on to the next step.

Step 2: Numbers Divisible by 4 - Next, we'll identify the numbers from the previous step that are also divisible by 4. - We'll then proceed to the final step.

Step 3: Numbers Divisible by 5 - Finally, we'll identify the numbers from the previous step that are divisible by 5. - We'll then count how many numbers meet all the criteria.

Calculating the Numbers

Let's start with the first step and find the numbers divisible by 3.

The numbers from 1 to 100 that are divisible by 3 are: 1. 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99

Now, let's move on to the next step and find the numbers from the previous list that are also divisible by 4.

The numbers from the previous list that are divisible by 4 are: 1. 12, 24, 36, 48, 60, 72, 84, 96

Finally, let's identify the numbers from the previous list that are divisible by 5.

The numbers from the previous list that are divisible by 5 are: 1. 60

Conclusion

After following the given steps, we found that the number 60 is the only number from 1 to 100 that is divisible by 3, 4, and 5. Therefore, only one number meets all the criteria, not two.