Question

Какое число нужно написать в числителе, чтобы равенство стало верным? 7/21 ?/3

Answer 1

Основное свойство дроби: числитель и знаменатель дроби можно умножить (или разделить) на одно и то же, неравное нулю, число.

Если разделить числитель и знаменатель дроби 7/21 на 7 (сократить дробь0, то получим дробь 1/3. Значит, в числителе указанной дроби ?/3 нужно написать число 1.

Ответ: 1.

Answer 2

Finding the Missing Number in the Numerator

To find the missing number in the numerator of the fraction 7/21 ?/3, we can use the following approach:

Step 1: Calculate the missing number using the relationship between the two fractions.

Step 2: Apply the relationship between the fractions to find the missing number in the numerator.

Calculation

To find the missing number in the numerator of the fraction 7/21 ?/3, we can use the relationship between the two fractions. The relationship between two fractions is that they are equal if their cross products are equal. In this case, we can use the formula:

a/b = c/d where a, b, c, d are integers and b, d ≠ 0.

Using this relationship, we can calculate the missing number in the numerator as follows:

7/21 = ?/3

7 × 3 = 21 × ?

21? = 21

Solution

By solving the equation 21? = 21, we find that the missing number in the numerator is 1.

Therefore, the missing number in the numerator to make the equality true is 1.

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