Question

1. Найдите значение выражения: 120-2в·2 при в=21. 2. Решите уравнение: 96: (х-9)=12 3. Прямоугольный садовый участок, площадью которого равна 4 сотки, огорожен забором. Длина участка 50 м. Какова длина забора?

Answer 1

1. 120-2в*2 при в=21
120 - 2в*2 = 120 - 2*21*2 = 120 - 84 = 36
сорян я только первое могу

Answer 2

Значение выражения: 120 - 2в · 2 при в = 21

To find the value of the expression 120 - 2в · 2 when в is equal to 21, we can substitute the value of в into the expression and simplify it.

Given: в = 21

Substituting в = 21 into the expression, we have:

120 - 2(21) · 2

Now we can simplify the expression using the order of operations (PEMDAS/BODMAS). First, perform the multiplication inside the parentheses:

120 - 2(42)

Next, multiply 2 by 42:

120 - 84

Finally, subtract 84 from 120:

Answer: The value of the expression 120 - 2в · 2 when в = 21 is 36.

Решение уравнения: 96 ÷ (х - 9) = 12

To solve the equation 96 ÷ (х - 9) = 12, we need to isolate the variable х. Here's how we can do it:

Given: 96 ÷ (х - 9) = 12

First, we can multiply both sides of the equation by (х - 9) to get rid of the division:

96 = 12(х - 9)

Next, distribute 12 to both terms inside the parentheses:

96 = 12х - 108

Now, add 108 to both sides of the equation to isolate the variable х:

96 + 108 = 12х

Simplifying:

204 = 12х

Finally, divide both sides of the equation by 12 to solve for х:

204 ÷ 12 = х

Answer: The solution to the equation 96 ÷ (х - 9) = 12 is х = 17.

Расчет длины забора прямоугольного садового участка

Given: Площадь садового участка = 4 сотки Длина участка = 50 м

To calculate the length of the fence, we need to find the perimeter of the rectangular garden.

The perimeter of a rectangle is given by the formula: P = 2(Length + Width)

In this case, we know the length of the garden is 50 meters, but the width is not provided. However, we can calculate the width using the given area.

The area of a rectangle is given by the formula: A = Length × Width

Given: Area = 4 сотки

To convert the area from сотки to square meters, we need to know the conversion factor. Let's assume 1 сотка = 100 square meters.

Area in square meters = 4 сотки × 100 square meters/сотка = 400 square meters

Now, we can use the area and the length to find the width:

400 square meters = 50 meters × Width

Dividing both sides of the equation by 50 meters:

Width = 400 square meters / 50 meters = 8 meters

Now that we know the width and length of the garden, we can calculate the perimeter:

P = 2(Length + Width) = 2(50 meters + 8 meters) = 2(58 meters) = 116 meters

Answer: The length of the fence surrounding the rectangular garden is 116 meters.