Помогите пожалуйста!!!
а)
[tex] - 5 < 2x + 1 < 3[/tex]
б)
[tex](x - 3)(x + 4)(2x + 4) < 0[/tex]
в) ОДЗ:
[tex] \sqrt{ - ( {x}^{2} + x - 20} [/tex]
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