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$ А  H=\frac{LG+EN-2MF}{2 \left( EG-F^{2} \right) }  Б  H=\frac{LG-2MF+EN}{\sqrt[]{EG-F^{2}}} В  H=\frac{LN-M^{2}}{EG-F^{2}}  Г  H=\frac{EG-F^{2}}{LN-M^{2}}  $
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