Thưa thầy hai bài này làm thế nào ạ?$\quad \quad $ c) $\sqrt {2{x^2} + 23} = 4x - 2 + \sqrt {2{x^2} + 7}$
$\quad \quad $ d) $\sqrt {{x^2} + 15} = 3x - 2 + \sqrt {{x^2} + 8}$
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