\(c,PT\Leftrightarrow x\left(\sqrt{3}-\sqrt{2}\right)=\sqrt{3}+\sqrt{2}\\ \Leftrightarrow x=\dfrac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}=\left(\sqrt{3}+\sqrt{2}\right)^2=5+2\sqrt{6}\\ d,PT\Leftrightarrow x+3x=3\Leftrightarrow x=\dfrac{3}{4}\)
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