Question

Задание 8Если известно, чтоa + b = 12 и a = b + 5 то найдите значение выражения​

Answer 1

Ответ:

(б+5)+б=12 | б+5 это а|

2б=12-5

2б=7

б=3.5

а=3.5+5=8.5

а^2=72.25

б^2=12.25

а^2-б^2=72.25-12.25=60

Объяснение:

Answer 2

Calculating the Value of an Expression

To find the value of the expression when it is known that a + b = 12 and a = b + 5, we can use the given information to solve for the values of a and b.

Given: - a + b = 12 - a = b + 5

Solution:

We can substitute the value of a from the second equation into the first equation to solve for b.

Substitute a = b + 5 into the equation a + b = 12: (b + 5) + b = 12 2b + 5 = 12 2b = 12 - 5 2b = 7 b = 7 / 2 b = 3.5

Now that we have the value of b, we can find the value of a using the second equation.

a = b + 5 a = 3.5 + 5 a = 8.5

Answer:

So, the value of the expression when a + b = 12 and a = b + 5 is 8.5 + 3.5 = 12.