Question

(х-3 13/21)+2 10/21=7 2/21 1 5/7*х-5/9=2 4/9

Answer 1

Ответ:

Пошаговое объяснение:

(х-3 13/21)+2 10/21=7 2/21

Х=7 2/21+3 13/21-2 10/21

Х=8 5/21

1 5/7*х-5/9=2 4/9

1 5/7х=2 4/9+5/9

1 5/7х=3

Х=3:1 5/7=3*7/12

Х=7/4=1 3/4

Answer 2

1.

$(x - \frac{13}{7} ) + \frac{20}{21} = \frac{2}{3} \\ x - \frac{13}{7} + \frac{20}{21} = \frac{2}{3} \\ x = \frac{2}{3} + \frac{19}{21} \\ x = \frac{11}{7} = 1 \frac{4}{7}$

2.

$\frac{25}{65} x = \frac{8}{9} \\ x = \frac{56}{25} = 2 \frac{6}{25}$

Answer 3

To solve the equations, we need to find the value of 'х'. Let's start with the first equation:

1. (х - 3) + (13/21) + 2 + (10/21) = 7 + (2/21)

First, let's combine the constants:

(х - 3) + 2 = 7

Next, let's combine the fractions on the left side:

(13/21) + (10/21) = 23/21

So, the equation becomes:

х - 1 + 23/21 = 7 + 2/21

Now, let's get the 'x' term on one side and the constant term on the other side:

х - 1 = 7 + 2/21 - 23/21

х - 1 = 7 - 21/21

х - 1 = 7 - 1

х - 1 = 6

Now, let's isolate 'х' by adding 1 to both sides:

х = 6 + 1

х = 7

So, the value of 'х' in the first equation is 7.

Now, let's move on to the second equation:

2. (1 5/7) * х - 5/9 = 2 4/9

First, convert the mixed number (1 5/7) into an improper fraction:

(7 + 5)/7 = 12/7

Now, the equation becomes:

(12/7) * х - 5/9 = 2 4/9

Next, convert the mixed number (2 4/9) into an improper fraction:

(9 * 2 + 4)/9 = 22/9

The equation is now:

(12/7) * х - 5/9 = 22/9

To isolate the 'х' term, we need to get rid of the constant term (-5/9). We can do this by adding 5/9 to both sides:

(12/7) * х = 22/9 + 5/9

(12/7) * х = 27/9

Now, let's solve for 'х' by multiplying both sides by the reciprocal of (12/7):

х = (27/9) * (7/12)

Now, simplify the right side:

х = (3/1) * (1/4)

х = 3/4

So, the value of 'х' in the second equation is 3/4.

To summarize:

1. The value of 'х' in the first equation is 7.
2. The value of 'х' in the second equation is 3/4.