Question

(1) 1 5/12 + x = ... (4) x - ... = 0.9 ( 7) x + 17,92 = ... (10) ... - x = 12 7/30 (2) x - 6,28 = ... (5) x + ... = 10 3/20 (8) ... - 0,723 (11) x - 31,9 = ... (3) 23,2 + x = ... (6) 50,32 x = ... (9) ... + x = 3 4/21 (12) ... + x = 0,75

Answer 1

Ответ:

1) 3х = 28 - х

   3х + х = 28

   4х = 28

   х = 28 : 4

   х = 7

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  3 * 7 = 28 - 7

  21 = 28 - 7

  21 = 21

2) 5х + 12 = 8х + 30

   5х - 8х = 30 - 12

   - 3х = 18

   х = 18 : (- 3)

   х = - 6

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  5 * (- 6) + 12 = 8 * (- 6) + 30

  - 30 + 12 = - 48 + 30

  - 18 = - 18

3) 33 + 8х = - 5х + 72

   8х + 5х = 72 - 33

   13х = 39

   х = 39 : 13

   х = 3

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  33 + 8 * 3 = - 5 * 3 + 72

  33 + 24 = - 15 + 72

  57 = 57

4) 6х - 19 = - х - 10

   6х + х = - 10 + 19

   7х = 9

   х = 9/7

   x = 1 2/7

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  6 * 1 2/7 - 19 = - 1 2/7 - 10

  6 * 9/7 - 19 = - 11 2/7

  54/7 - 19 = - 11 2/7

  7 5/7 - 19 = - 11 2/7

  - 11 2/7 = - 11 2/7

5) 0,7 - 0,2х = 0,3х - 1,8

   - 0,2х - 0,3х = - 1,8 - 0,7

   - 0,5х = - 2,5

  х = - 2,5 : (- 0,5)

  х = 5

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  0,7 - 0,2 * 5 = 0,3 * 5 - 1,8

  0,7 - 1 = 1,5 - 1,8

  - 0,3 = - 0,3

6) 0,1х + 9 = 0,2х  - 4

   0,1 х - 0,2х = - 4 - 9

   - 0,1х = - 13

   х = - 13 : (- 0,1)

   х = 130

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  0,1 * 130 + 9 = 0,2 * 130 - 4

  13 + 9 = 26 - 4

  22 = 22

Answer 2

To solve these equations, let's take them one at a time.

(1) $1 \frac{5}{12} + x$:

To solve this, you need to add $1 \frac{5}{12}$ and $x$ together. Let's first convert the mixed number to an improper fraction:

$1 \frac{5}{12} = \frac{17}{12}$

So the equation becomes:

$\frac{17}{12} + x$

(2) $x - 6.28$:

To solve this, you need to subtract $6.28$ from $x$.

(3) $23.2 + x$:

To solve this, you need to add $23.2$ and $x$ together.

(4) $x - \text{something} = 0.9$:

This equation is incomplete. It seems to be missing some information.

(5) $x + \text{something} = 10 \frac{3}{20}$:

This equation is also incomplete as it misses some information.

(6) $50.32x$:

This is not an equation but an expression. If you are looking to solve for $x$, more context is needed.

(7) $x + 17.92 = \text{something}$:

This equation is also incomplete without the complete information.

(8) $\text{something} - 0.723$:

This equation is also incomplete.

(9) $\text{something} + x = 3 \frac{4}{21}$:

This equation is incomplete without the complete information.

(10) $\text{something} - x = 12 \frac{7}{30}$:

This equation is incomplete without the complete information.

(11) $x - 31.9 = \text{something}$:

This equation is also incomplete.

(12) $\text{something} + x = 0.75$:

This equation is incomplete without the complete information.

Please provide the complete information for the remaining equations so that I can help you solve them.