Câu hỏi:  

A V= \frac{a^{3}\sqrt{3}}{86}; d= \frac{a\sqrt{6}}{2}

B V= \frac{a^{3}\sqrt{3}}{86}; d= \frac{a\sqrt{6}}{3}

C V= \frac{a^{3}\sqrt{3}}{144}; d= \frac{a\sqrt{6}}{4}

D V= \frac{a^{3}\sqrt{3}}{144}; d= \frac{a\sqrt{6}}{3}