Question

3/7=х/49; х/10=5/25; 4/13=х/39 ?

Answer 1

Ответ:

3/7=х/49

3×49=7х

147=7х

х=21

х/10=5/25

25х=10×5

25х=50

х=2

4/13=х/39

13х=4×39

13х=156

х=12

Answer 2

To solve these equations, we'll use the concept of cross-multiplication. Let's go through each equation step by step:

1. 3/7 = x/49

To solve for x, we'll cross-multiply:

3 * 49 = 7 * x 147 = 7x

Now, we can isolate x by dividing both sides of the equation by 7:

147/7 = x 21 = x

Therefore, x = 21.

2. x/10 = 5/25

Again, cross-multiplying:

x * 25 = 10 * 5 25x = 50

Divide both sides of the equation by 25:

25x/25 = 50/25 x = 2

So, x = 2.

3. 4/13 = x/39

Cross-multiplication:

4 * 39 = 13 * x 156 = 13x

Divide both sides of the equation by 13:

156/13 = x 12 = x

Thus, x = 12.

In summary:

• In the first equation, x = 21.
• In the second equation, x = 2.
• In the third equation, x = 12.