Question

3х+8=29, . Знайти значення виразу 15а+8, якщо а=1, 10х-12, якщо х=7 , 115:(17+3х)=5, пожалуйста

Answer 1

Знаходимо значення x, розв'язавши рівняння 3х+8=29:

3х+8=29

3х=29-8

3х=21

x=7

Підставляємо знайдене значення x у вирази і обчислюємо їх:

15а+8, якщо а=1:

15*1+8=23

10х-12, якщо x=7:

10*7-12=58

115:(17+3х)=5:

115=5*(17+3х)

23=17+3х

6=3х

x=2

Отже, значення виразів:

15а+8, якщо а=1: 23

10х-12, якщо x=7: 58

115:(17+3х)=5, якщо x=7: 2.

Answer 2

Solving the Equation 3x + 8 = 29

To find the value of x in the equation 3x + 8 = 29, we need to isolate x on one side of the equation. Here's how we can solve it step by step:

1. Subtract 8 from both sides of the equation: 3x + 8 - 8 = 29 - 8 3x = 21

2. Divide both sides of the equation by 3 to solve for x: 3x/3 = 21/3 x = 7

Therefore, the value of x in the equation 3x + 8 = 29 is x = 7.

Finding the Value of the Expression 15a + 8, given a = 1

To find the value of the expression 15a + 8, we substitute the value of a into the expression. In this case, a = 1. Let's calculate it:

15a + 8 15(1) + 8 15 + 8 23

Therefore, the value of the expression 15a + 8, when a = 1, is 23.

Finding the Value of the Expression 10x - 12, given x = 7

To find the value of the expression 10x - 12, we substitute the value of x into the expression. In this case, x = 7. Let's calculate it:

10x - 12 10(7) - 12 70 - 12 58

Therefore, the value of the expression 10x - 12, when x = 7, is 58.

Finding the Value of the Expression 115:(17 + 3x), given x = 5

To find the value of the expression 115:(17 + 3x), we substitute the value of x into the expression. In this case, x = 5. Let's calculate it:

115:(17 + 3x) 115:(17 + 3(5)) 115:(17 + 15) 115:32 3.59375

Therefore, the value of the expression 115:(17 + 3x), when x = 5, is approximately 3.59375.

I hope this helps! Let me know if you have any further questions.