- Bài toán thể tích kết hợp với bài toán tính góc - Có video chữa

A $\dpi{100} 30^{0}$

B $\dpi{100} 45^{0}$

C $\dpi{100} 60^{0}$

D $\dpi{100} 90^{0}$

A $\dpi{100} V_{S.ABC}= \frac{a^{3}\sqrt{3}}{8}$ ; cos (AC,SB)= $\dpi{100} \frac{\sqrt{7}}{7}$

B $\dpi{100} V_{S.ABC}= \frac{a^{3}\sqrt{3}}{8}$ ; cos (AC,SB) = - $\dpi{100} \frac{\sqrt{7}}{7}$

C $\dpi{100} V_{S.ABC}= \frac{2a^{3}\sqrt{3}}{8}$ ; cos (AC,SB)= $\dpi{100} \frac{\sqrt{7}}{7}$

D $\dpi{100} V_{S.ABC}= \frac{2a^{3}\sqrt{3}}{8}$ ; cos (AC,SB) = - $\dpi{100} \frac{\sqrt{7}}{7}$

A $\dpi{100} V_{S.ABC}= \frac{a^{3}\sqrt{3}}{8}$ ; cos (AC,SB)= $\dpi{100} \frac{\sqrt{7}}{7}$

B $\dpi{100} V_{S.ABC}= \frac{a^{3}\sqrt{3}}{8}$ ; cos (AC,SB) = - $\dpi{100} \frac{\sqrt{7}}{7}$

C $\dpi{100} V_{S.ABC}= \frac{2a^{3}\sqrt{3}}{8}$ ; cos (AC,SB)= $\dpi{100} \frac{\sqrt{7}}{7}$

D $\dpi{100} V_{S.ABC}= \frac{2a^{3}\sqrt{3}}{8}$ ; cos (AC,SB) = - $\dpi{100} \frac{\sqrt{7}}{7}$

- Bài toán thể tích kết hợp với bài toán tính góc...