Question

Дам за это 39 баловв срочно пл!!!! Первое не надо! Решить уравнения 1. 2. (156-x)+43=170. 3. (23 – х) – 21 = 2. 4. (5·с – 8) : 2 = 121 : 11. 5. 821 – (m + 268) = 349. 6. 5,04:(104,2-х)=1,2. 7. 1,2х + 4,5х - 0,7 = 1,01. 8. 6,72:(203,2-х) = 2,1. 9. 1,3х + 3,8х-0,03 = 2,01. 10. 1,904:(3,2х-28,6) = 0,56. 11. 0,02х+0,5х+0,092=0,3. 12. 2,021:(2,3х-41,7)=0,47. 13. 0,7х-0,01х+0,074=0,5 14. 0,72х+0,065-0,0071=0,04. 15. 190,62:(8,127:(4,5х+2,11))=70,6.

Answer 1

(156-x)+43=170.
156-х=170-43
156-х=127
-х=127-156
-х=-29
х=29
7. 1,2х + 4,5х - 0,7 = 1,01.
1,2х+4,5х=1,01+0,7
5,7х=1,71
х=1,71:5,7
х=0,3
9. 1,3х + 3,8х-0,03 = 2,01.
1,3х+3,8х=2,01+0,03
5,1х=2,04
х=2,04:5,1
х=0,4

Answer 2

Давайте решим каждое из уравнений по порядку:

1. \(2 = 2\) (очевидно и верно, просто проверка).

2. \(156 - x + 43 = 170\):

\[ \begin{align*} &156 - x + 43 = 170 \\ &156 + 43 - 170 = x \\ &29 = x \end{align*} \]

Ответ: \(x = 29\).

3. \(23 - x - 21 = 2\):

\[ \begin{align*} &23 - x - 21 = 2 \\ &2 - x = 2 \\ &-x = 0 \\ &x = 0 \end{align*} \]

Ответ: \(x = 0\).

4. \(\frac{5c - 8}{2} = \frac{121}{11}\):

Умножим обе стороны на 2 и затем поделим на 5:

\[ \begin{align*} &5c - 8 = \frac{242}{11} \\ &5c = \frac{242}{11} + 8 \\ &5c = \frac{242 + 88}{11} \\ &5c = \frac{330}{11} \\ &c = \frac{66}{11} \\ &c = 6 \end{align*} \]

Ответ: \(c = 6\).

5. \(821 - (m + 268) = 349\):

\[ \begin{align*} &821 - m - 268 = 349 \\ &553 - m = 349 \\ &-m = 349 - 553 \\ &-m = -204 \\ &m = 204 \end{align*} \]

Ответ: \(m = 204\).

6. \(\frac{5.04}{104.2 - x} = 1.2\):

Умножим обе стороны на \(104.2 - x\):

\[ \begin{align*} &5.04 = 1.2(104.2 - x) \\ &5.04 = 125.04 - 1.2x \\ &1.2x = 125.04 - 5.04 \\ &1.2x = 120 \\ &x = \frac{120}{1.2} \\ &x = 100 \end{align*} \]

Ответ: \(x = 100\).

7. \(1.2x + 4.5x - 0.7 = 1.01\):

\[ \begin{align*} &5.7x - 0.7 = 1.01 \\ &5.7x = 1.01 + 0.7 \\ &5.7x = 1.71 \\ &x = \frac{1.71}{5.7} \\ &x = 0.3 \end{align*} \]

Ответ: \(x = 0.3\).

8. \(\frac{6.72}{203.2 - x} = 2.1\):

Умножим обе стороны на \(203.2 - x\):

\[ \begin{align*} &6.72 = 2.1(203.2 - x) \\ &6.72 = 426.72 - 2.1x \\ &2.1x = 426.72 - 6.72 \\ &2.1x = 420 \\ &x = \frac{420}{2.1} \\ &x = 200 \end{align*} \]

Ответ: \(x = 200\).

9. \(1.3x + 3.8x - 0.03 = 2.01\):

\[ \begin{align*} &5.1x - 0.03 = 2.01 \\ &5.1x = 2.01 + 0.03 \\ &5.1x = 2.04 \\ &x = \frac{2.04}{5.1} \\ &x = 0.4 \end{align*} \]

Ответ: \(x = 0.4\).

10. \(\frac{1.904}{3.2x - 28.6} = 0.56\):

Умножим обе стороны на \(3.2x - 28.6\):

\[ \begin{align*} &1.904 = 0.56(3.2x - 28.6) \\ &1.904 = 1.792x - 15.976 \\ &1.792x = 1.904 + 15.976 \\ &1.792x = 17.88 \\ &x = \frac{17.88}{1.792} \\ &x = 10 \end{align*} \]

Ответ: \(x = 10\).

11. \(0.02x + 0.5x + 0.092 = 0.3\):

\[ \begin{align*} &0.52x + 0.092 = 0.3 \\ &0.52x = 0.3 - 0.092 \\ &0.52x = 0.208 \\ &x = \frac{0.208}{0.52} \\ &x = 0.4 \end{align*} \]

Ответ: \(x = 0.4\).

12. \(\frac{2.021}{2.3x - 41.7} = 0.47\):

Умножим обе стороны на \(2.3x - 41.7\):

\[ \begin{align*} &2.021 = 0.47(2.3x - 41.7) \\ &2.021 = 1.081x - 19.659 \\ &1.081x = 2.021 + 19.659 \\ &1.081x = 21.68 \\ &x = \frac{21.68}{1.081} \\ &x = 20 \end{align*} \]

Ответ: \(x = 20\).

13. \(0.7x - 0.01x + 0.074 = 0.