Question

Известно, что 4а+8b=10, найдите значение выражения 5/a+2b ?

Answer 1

Ответ:2

Умнадаем всё на 4 получается так что 20/10

Answer 2

4а + 8b = 10 поделим на 4 получим а)а+2в=2,5б) 5/2,5=2
3) Числитель a в квадрате + 4ab + 4b в квадрате , черта дроби знаменатель 2a + 4b = (а+2в) в квадрате /2*2,5=2,5 в квадрате/2*2,5=2,5/2=1,25

Answer 3

To find the value of the expression 5/a + 2b, we first need to find the values of 'a' and 'b' from the given equation 4a + 8b = 10.

Given: 4a + 8b = 10

Step 1: Let's simplify the equation by dividing both sides by 2: (4a + 8b)/2 = 10/2 2a + 4b = 5

Step 2: Now, we have two equations:

1. 4a + 8b = 10
2. 2a + 4b = 5

Step 3: Let's solve this system of equations. We can use any method, but let's use the substitution method:

From equation 2, we can express 'a' in terms of 'b': 2a = 5 - 4b a = (5 - 4b)/2

Step 4: Now, substitute the value of 'a' in terms of 'b' into the first equation: 4((5 - 4b)/2) + 8b = 10 2(5 - 4b) + 8b = 10 10 - 8b + 8b = 10 10 = 10

Step 5: As you can see, the equation simplifies to 10 = 10, which means that 'b' can have any value. Let's take 'b' as 0 for simplicity.

If b = 0, then from equation 2: 2a + 4(0) = 5 2a = 5 a = 5/2

So, when b = 0, a = 5/2.

Now, let's find the value of the expression 5/a + 2b when a = 5/2 and b = 0: 5/(5/2) + 2(0) 5 * (2/5) + 0 2 + 0 2

Therefore, the value of the expression 5/a + 2b is 2.