Question

(c+4 8/21)-7 13/21=2 12/21

Answer 1

Ответ:

Пошаговое объяснение:

(c+4 8/21)-7 13/21=2 12/21

С=2 12/21+7 13/21-4 8/21

С=5 17/21

Answer 2

Let's solve the equation step by step:

First, let's add the fractions within the parentheses: (c + 4 8/21) - 7 13/21

To add these fractions, we need to find a common denominator. In this case, the common denominator is 21.

So, (8/21) can be rewritten as (8/21) * (1), and (13/21) can be rewritten as (13/21) * (1).

Now, the equation becomes:

(c + 4 8/21) - 7 13/21 = (c + (8/21)) - (7 + (13/21))

Now, we can add the fractions separately:

(c + 8/21) - (7 + 13/21)

Next, we can combine the constants and fractions:

(c - 7) + (8/21 - 13/21)

Now, let's subtract the fractions:

(c - 7) + (-5/21)

Now, we can combine the constants and fractions:

c - 7 - 5/21

To simplify further, we can write the constant 7 as a fraction with a denominator of 21:

c - (7 * 21/21) - 5/21

c - 147/21 - 5/21

Now, let's subtract the fractions:

c - (147/21 + 5/21)

c - 152/21

So, the simplified expression is:

c - 152/21

Now, you mentioned that this equals 2 12/21. Let's convert 2 12/21 to an improper fraction:

2 12/21 = (2 * 21 + 12)/21 = 54/21

Now, we can set the two expressions equal to each other:

c - 152/21 = 54/21

To isolate c, add 152/21 to both sides of the equation:

c = 54/21 + 152/21

c = (54 + 152)/21

c = 206/21

So, the value of c is 206/21.