77. Найдите все значения х при которых имеет смысл выраже-
Ние
[tex] \sqrt{ - x} [/tex]
[tex] \sqrt{1 - 5x} [/tex]

[tex] \sqrt{ \sqrt{7 - x} } [/tex]
[tex] \sqrt{8 - x} [/tex]

[tex] \sqrt{x - 9} [/tex]
[tex] \sqrt{ - x - 10} [/tex]
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