Question

Найдите х в пропорциях: 1) 15: 2,5 = 0,8 х : 2/3 На с в школе учили так : 0,8х = 15 * 2/3 / 2,5 А дальше помогите мне пожалуйста, я не знаю что делать дальше. Если что вот это / это разделительная черта дроби)

Answer 1

(0,8х)×2,5=15×2/3
(0,8х)×2,5=10
(0,8х)=10:2,5
0,8х=4
х=4:0,8
х=5

Answer 2

Solving the Proportion

To solve for the value of x in the given proportion 15:2.5 = 0.8x:2/3, we can use the following steps:

1. Cross-multiply to solve for x: - Multiply 15 by 2/3 and 2.5 by 0.8, then set them equal to each other.

2. Solve for x using the equation obtained from step 1.

Let's proceed with the calculations.

Cross-Multiplying

We can cross-multiply the given proportion to solve for x:

15 * 2/3 = 0.8x * 2.5

Solving for x

Now, let's solve for x using the equation obtained from the cross-multiplication:

15 * 2/3 = 0.8x * 2.5

10 = 2x

x = 5

So, the value of x in the given proportion is 5.

This calculation is based on the cross-multiplication method to solve proportions.

I hope this helps! If you have any other questions or need further assistance, feel free to ask.