tìm điều kiện xác định và biểu diễn trên trục só ạ a) $\sqrt{(x-2)(x-3) }$ b) $\sqrt{x^{2}-x-12 }$ c) $\sqrt{x^{2}-x-30}$ d) $\sqrt{3x^{2}-7x+4}$ e) $\sqrt{4x^{2}-6x+2}$

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