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а) [tex] \frac{11+ \sqrt{21} }{11- \sqrt{21} } + \frac{11- \sqrt{21} }{11+ \sqrt{21} } [/tex]
б) [tex] \frac{1}{11-2 \sqrt{30} } - \frac{1}{11+2 \sqrt{30} } [/tex]
а) [tex] \frac{11+ \sqrt{21} }{11- \sqrt{21} } + \frac{11- \sqrt{21} }{11+ \sqrt{21} } [/tex]
б) [tex] \frac{1}{11-2 \sqrt{30} } - \frac{1}{11+2 \sqrt{30} } [/tex]
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