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МатематикаРешебник по алгебре 8 класс Мерзляк ФГОС Задание 332
Задание 332
\[\boxed{\text{332\ (332).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\text{\ \ }\]
\[1)\ \frac{8}{x} = 6 - x\]
\[y = \frac{8}{x}\]
| \[x\] | \[2\] | \[4\] | \[8\] | \[- 2\] | \[- 4\] | \[- 8\] |
|---|---|---|---|---|---|---|
| \[y\] | \[4\] | \[2\] | \[1\] | \[- 4\] | \[- 2\] | \[- 1\] |
\[y = 6 - x\]
| \[x\] | \[1\] | \[2\] | \[3\] |
|---|---|---|---|
| \[y\] | \[5\] | \[4\] | \[3\] |
\[Ответ:x = 2;x = 4.\]
\[2)\ 2x = \frac{2}{x}\]
\[y = 2x\]
| \[x\] | \[0\] | \[1\] | \[2\] |
|---|---|---|---|
| \[y\] | \[0\] | \[2\] | \[4\] |
\[y = \frac{2}{x}\]
| \[x\] | \[1\] | \[2\] | \[4\] | \[- 1\] | \[- 2\] | \[- 4\] |
|---|---|---|---|---|---|---|
| \[y\] | \[2\] | \[1\] | \[0,5\] | \[- 2\] | \[- 1\] | \[- 0,5\] |
\[Ответ:x = 1;x = \ - 1.\]
\[3)\frac{7}{x} = - x\ \]
\[y = \frac{7}{x}\]
| \[x\] | \[1\] | \[7\] | \[3,5\] | \[- 1\] | \[- 7\] | \[- 3,5\] |
|---|---|---|---|---|---|---|
| \[y\] | \[7\] | \[1\] | \[2\] | \[- 7\] | \[- 1\] | \[- 2\] |
\[y = - x\]
| \[x\] | \[1\] | \[0\] | \[- 2\] |
|---|---|---|---|
| \[y\] | \[- 1\] | \[0\] | \[2\] |
\[Ответ:нет\ корней.\]
\[\boxed{\text{332.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ \text{A\ }( - 4;\ - 7),:\]
\[\ - 7 = \frac{28}{- 4}\ \]
\[- 7 = - 7 \Longrightarrow проходит.\]
\[2)\ \text{B\ }( - 14;\ - 2),:\]
\[\ - 2 = \frac{28}{14}\]
\[- 2 \neq 2 \Longrightarrow \ не\ проходит.\]
\[3)\ \text{C\ }(0,5;14):\ \ \]
\[14 = \frac{28}{0,5}\ \]
\[14 \neq 56\ \Longrightarrow \ не\ проходит.\]
\[4)\ \text{D\ }(0,2;140):\ \]
\[140 = \frac{28}{0,2}\text{\ \ }\]
\[140 = 140\ \Longrightarrow \ проходит.\]
