Công thức:
\(m_a= \sqrt{\dfrac{b^2+c^2}{2}-\dfrac{a^2}{4}}\)
\(m_b= \sqrt{\dfrac{a^2+c^2}{2}-\dfrac{b^2}{4}}\)
\(m_c= \sqrt{\dfrac{a^2+b^2}{2}-\dfrac{c^2}{4}}\)
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