Question

1/2 b + 2/5 d - 7/10 b =4/5

Answer 1

Ответ:

d=4

Пошаговое объяснение:

9\10d-7\10d=4\5

1\5d=4\5

d=4\5:1\5

d=4

Ответ: d = 4

Answer 2

Ответ: b = 2d - 4

Пошаговое объяснение:

1/2 b + 2/5 d - 7/10 b =4/5

5b+4d-7b=8

-2b+4d=8

-2b=8-4d

b=-4+2d

b=2d - 4

Answer 3

To solve for the variable "d" in the equation 1/2b + 2/5d - 7/10b = 4/5, you need to isolate "d" on one side of the equation. Here's how you can do it step by step:

1. Combine like terms on the left side of the equation:

   (1/2b - 7/10b) + 2/5d = 4/5

2. To combine the b terms, find a common denominator, which is 10 in this case. So, you'll need to express 1/2b and 7/10b with a common denominator:

   (5/10b - 7/10b) + 2/5d = 4/5

3. Now, subtract the b terms:

   (5/10b - 7/10b) simplifies to (-2/10b) or (-1/5b):

   (-1/5b) + 2/5d = 4/5

4. Next, isolate the term with "d" by subtracting (-1/5b) from both sides of the equation:

   2/5d = 4/5 + 1/5b

5. Now, to solve for "d," you can divide both sides by 2/5:

   d = (4/5 + 1/5b) / (2/5)

When you divide by a fraction, it's the same as multiplying by its reciprocal, so:

d = (4/5 + 1/5b) * (5/2)

Now, simplify:

d = (4/5 + 1/5b) * (5/2) d = (4/5) * (5/2) + (1/5b) * (5/2) d = 4/2 + (5/10)b d = 2 + (1/2)b

So, the solution for "d" is:

d = 2 + (1/2)b