Question

Задание 1 А)(-35+20)×(2-6):10 Б)3,3×7,1+2,9×3,3 В)(3/8-1/6×(0,48:0,02) Задание 2 А ) число350 уменьшилина20%.Найдите новое число Б)найдите число5/8которого ровна40 В)Сколько процентов состовляет число 4 от 5 Задание3 Реш уров 4(y+0,5)-(y+1)=16

Answer 1

А) 1)-35+20=-15
2)2-6=-4
3)-15х(-4)=60
4)60:10=6
Б) (7,1+2,9)х3,3=10х3,3=33
Пока так, в В) там дробь же?

Answer 2

Задание 1:

A) (-35 + 20) × (2 - 6) ÷ 10

Let's simplify this expression step by step:

-35 + 20 = -15 2 - 6 = -4

Now we have (-15) × (-4) ÷ 10

To multiply two negative numbers, we get a positive result: (-15) × (-4) = 60

Now we have 60 ÷ 10 = 6

So the value of expression A is 6.

B) 3.3 × 7.1 + 2.9 × 3.3

To find the value of this expression, we can calculate each multiplication separately and then add the results:

3.3 × 7.1 = 23.43 2.9 × 3.3 = 9.57

Now we add the two results: 23.43 + 9.57 = 33

So the value of expression B is 33.

C) (3/8 - 1/6) × (0.48 ÷ 0.02)

To simplify this expression, we need to find a common denominator for the fractions:

3/8 = 9/24 1/6 = 4/24

Now we have (9/24 - 4/24) × (0.48 ÷ 0.02)

Subtracting the fractions, we get 5/24.

Now we have (5/24) × (0.48 ÷ 0.02)

Dividing 0.48 by 0.02, we get 24.

Finally, we have (5/24) × 24, which simplifies to just 5.

So the value of expression C is 5.

Задание 2:

A) Число 350 уменьшили на 20%.

To find the new number after a 20% decrease, we can multiply the original number by (100% - 20%) or 0.8.

350 × 0.8 = 280

So the new number is 280.

B) Найдите число 5/8, которого равно 40.

To find the value of the unknown number, we can set up a proportion:

5/8 = x/40

Cross-multiplying, we get:

8x = 5 * 40 8x = 200

Dividing both sides by 8, we find:

x = 25

So the number 5/8 is equal to 40.

C) Сколько процентов составляет число 4 от 5.

To find the percentage that 4 represents of 5, we can set up a proportion:

4/5 = x/100

Cross-multiplying, we get:

5x = 4 * 100 5x = 400

Dividing both sides by 5, we find:

x = 80

So the number 4 represents 80% of 5.

Задание 3:

Решение уравнения: 4(y + 0.5) - (y + 1) = 16

Let's solve this equation step by step:

First, distribute the 4 to the terms inside the parentheses:

4y + 2 - (y + 1) = 16

Next, remove the parentheses by applying the distributive property:

4y + 2 - y - 1 = 16

Combine like terms:

3y + 1 = 16

Subtract 1 from both sides:

3y = 15

Divide both sides by 3:

y = 5

So the solution to the equation is y = 5.