Помогите пж 50 баллов
Определи, при каких значениях x имеет смысл выражение
[tex]\frac{1}{\sqrt{25x^{2}-49 } }[/tex]
1)−1,4 2)−1,4≤x≤1,4
3)x≤−1,4,x≥1,4
4)x<−1,4,x
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