1) решить систему неравенств
[tex] \left \{ {{1-6x\ \textless \ 01} \atop {5x-7\ \textless \ x-7}} \right. [/tex]

2) решить систему уравнений
[tex] \left \{ {{y^{2}-3 x^{2} =-2 } \atop {x+2y=1}} \right. [/tex]

3) при каких значениях "х" имеет смысл выражение:
y=[tex] \frac{3}{ \sqrt{9- x^{2} } } [/tex]
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