Знайдіть область визначення функції :1) [tex]y = \frac{2x + 1}{x {}^{2} + x + 1 } [/tex]
2) [tex]y = \frac{x}{1 - x {}^{2} } [/tex]
3) [tex]y = \frac{x}{x + 1} + \frac{1}{x - 1} [/tex]
4) [tex]y = \sqrt{2x {}^{2} - x - 1} [/tex]
5)[tex]y = \sqrt{2x + 3} [/tex]
6) [tex]y = \frac{ \sqrt{x + 1} }{3 {x}^{2} + 7x - 6 } [/tex]
7) [tex]y = \sqrt{ \frac{4 - x}{x + 0.5} } [/tex]
Срочноо​
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