Найдите область определения каждого из выражений:
а)
[tex]2x-5, \frac{1}{2x-5} и \sqrt{2x-5} [/tex]
б)[tex]2 x^{2} +7x-4, \frac{1}{2 x^{2} +7x-4} и\sqrt{ \frac{1}{2 x^{2} +7x-4} } [/tex]
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