Question

даю 40 балов срочнооо! Самостійна робота 3. Площа поля 520 га. За добу зібрали урожай з 18% поля. З якої площі було зібрано врожай? 4. Туристи пройшли 26 км, що становить 65 % шляху. Яка довжина шляху? 5. У бібліотеці 1800 книжок. З них 28 % книжки науково-популярної тематики, 43 % - зарубіжних письменників, а решта --- українських. Скільки книжок українських письменників ? ​пжжжжжжжжжжжжжж

Answer 1

Задача 3.

Дано:                    Решение:

S = 520 га            S(1) = S*v = 520*18% = 520*0,18 = 93,6 га.

v = 0,18S/день        

S(1) - ?                   Ответ: 93,6 га.

Задача 4.

Дано:                    Решение:

S₁ = 26км              S₁ = S*65% = S*0,65 = 26 (км) =>

S₁ = S*65%            => S = S₁/0,65 = 26/0,65 = 40 (км)

S - ?                       Ответ: 40 км.

Задача 5.

Дано:                                                                      Решение:

N(объём ген. совокупности) = 1800 книг         n₃ = N*w₃

w₁ (Науч.поп) = 28%                                              w₃ = 100% - 28% - 43% =

w₂(Ин. писатели) = 43%                                        = 29% = 0,29

n₃(Укр.) - ?                                                      n₃ = 1800 * 0,29 = 522 (книги)

                                                                              Ответ: 522 книги.

Answer 2

Answer:

Task 3: The total area of the field is 520 hectares. They harvested 18% of the field in one day. To find the area of the harvested crop, we need to calculate 18% of 520 hectares.

To calculate the area of the harvested crop, we can use the following formula:

Area of harvested crop = Total area of the field * Percentage of the field harvested

Substituting the values into the formula:

Area of harvested crop = 520 hectares * 18% = 520 hectares * 0.18 = 93.6 hectares

Therefore, the area of the field that was harvested is 93.6 hectares. [[1]]

Task 4: The tourists walked 26 km, which represents 65% of the total distance. We need to find the total distance traveled by the tourists.

To find the total distance, we can use the following formula:

Total distance = Distance traveled / Percentage of the total distance

Substituting the values into the formula:

Total distance = 26 km / 65% = 26 km / 0.65 = 40 km

Therefore, the total distance traveled by the tourists is 40 km. [[2]]

Task 5: The library has a total of 1800 books. Of these, 28% are books on scientific-popular topics, 43% are books by foreign authors, and the rest are Ukrainian books. We need to find the number of Ukrainian books in the library.

To find the number of Ukrainian books, we can subtract the number of books on scientific-popular topics and books by foreign authors from the total number of books.

Number of Ukrainian books = Total number of books - Number of books on scientific-popular topics - Number of books by foreign authors

Substituting the values into the formula:

Number of Ukrainian books = 1800 books - 28% of 1800 books - 43% of 1800 books

Calculating the percentages:

Number of Ukrainian books = 1800 books - 0.28 * 1800 books - 0.43 * 1800 books

Number of Ukrainian books = 1800 books - 504 books - 774 books

Number of Ukrainian books = 522 books

Therefore, the number of Ukrainian books in the library is 522 books. [[3]]