Stake attention in this memory
The image shows a page from a mathematics textbook, likely for middle school or early high school, with a green header that reads "B Упражнения" (B Exercises). The exercises are primarily focused on solving proportions and equations. The content is in Russian. There are no people or any elements related to the city of Kostanay, Kazakhstan, present in the image. It is a close-up of a book page. The exercises are numbered and include various types of problems: * **131-133:** Solving equations and proportions. Examples include `75 : (2x) = 15 : 25`, `(5x) : 13 = 8 : 52`, `44 : 99 = 4 : (3x)`, `10,5 : 21 = (4x) : 20`, and fractional equations like `2,5 / 7y = 5 / 42`. * **133:** Solving for a variable `k` in proportions, such as `3/7 : k = 5 : 2 1/3` and `5,5 : 8 = k : 2/11`. * **134:** Instructions to "Составьте различные пропорции из соответствующих значений величин" (Form different proportions from corresponding values of quantities). It then lists four categories of quantities: lengths of a rectangle, cost of goods, distance and time, and amount of work. * **135-137:** More problems involving solving for a variable `y` in proportions. Examples include `(y + 5) / 110 = 42 / 660`, `77 / 800 = 7,7 / (y + 53)`, `25 / (17 - y) = 200 / 56`, `1 / 1,8 = (40 - y) / 32,4`, `35 : (21 - 5y) = 5 : 2`, `53 : 4 = 212 : (6y - 8)`, `(3y - 7) : 5 = 33 : 15`, `11y / 20 = 16 : 80`, and `7,2 : 2,7 = 32y / 3`. The page appears to be from a printed book, with the text and mathematical notation clearly visible. There is a light gray horizontal bar obscuring the bottom part of the image.
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