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[tex] \frac{9 c^{2}-4 b^{2} }{18 c^{2}-12bc } [/tex] при [tex]b=0,5; c= \frac{2}{3} [/tex]
[tex] \frac{9 c^{2}-4 b^{2} }{18 c^{2}-12bc } [/tex] при [tex]b=0,5; c= \frac{2}{3} [/tex]
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