tex] помогиите пожалуййста, надо сократить(...

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[tex] \frac{ \sqrt{27}- \sqrt{21} - \sqrt{15} }{3- \sqrt{7} - \sqrt{5} } [/tex] помогиите пожалуййста, надо сократить(

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$\frac{ \sqrt{27}- \sqrt{21}- \sqrt{5}}{3- \sqrt{7}- \sqrt{5}} = \frac{ \sqrt{9}* \sqrt{3}- \sqrt{7}* \sqrt{3}- \sqrt{5}* \sqrt{3}}{3- \sqrt{7}-\sqrt{5}} = \frac{ \sqrt{3}*(3-\sqrt{7}-\sqrt{5})}{3- \sqrt{7}-\sqrt{5}} = \sqrt{3}$

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