80 câu trắc nghiệm: Thể tích khối đa diện có đáp á...

A. $\mathrm{V}=\frac{\sqrt{3}}{8}{\mathrm{a}}^3$

B. $\mathrm{V}=\frac{\sqrt{2}}{12}{\mathrm{a}}^3$

C. $\mathrm{V}=\frac{\sqrt{3}}{12}{\mathrm{a}}^3$

D. $\mathrm{V}=\frac{\sqrt{3}}{24}{\mathrm{a}}^3$

A. $k=\frac{1}{3}$

B. $k=\frac{\sqrt{2}}{4}$

C. $k=\frac{4}{9}$

D. $k=\frac{2}{3}$

A. $\mathrm{V}=\frac{\sqrt{14}}{54}{\mathrm{a}}^3$

B. $\mathrm{V}=\frac{\sqrt{14}}{64}{\mathrm{a}}^3$

C. $\mathrm{V}=\frac{\sqrt{14}}{49}{\mathrm{a}}^3$

D. $\mathrm{V}=\frac{4}{61}{\mathrm{a}}^3$

A. $\mathrm{h}=\frac{2}{3}\mathrm{a}$

B. $\mathrm{h}=\frac{4}{3}\mathrm{a}$

C. $\mathrm{h}=\frac{8}{3}\mathrm{a}$

D. $\mathrm{h}=\frac{3}{4}\mathrm{a}$

A. ${\mathrm{S}}_{\mathrm{ABC}}=\frac{\sqrt{14}}{9}{\mathrm{a}}^2$

B. ${\mathrm{S}}_{\mathrm{ABC}}=\frac{\sqrt{14}}{6}{\mathrm{a}}^2$

C. ${\mathrm{S}}_{\mathrm{ABC}}=\frac{14}{4}{\mathrm{a}}^2$

D. ${\mathrm{S}}_{\mathrm{ABC}}=\frac{\sqrt{14}}{2}{\mathrm{a}}^2$

A. $k=\frac{1}{4}$

B. $k=\frac{1}{3}$

C. $k=\frac{1}{6}$

D. $k=\frac{2}{9}$

A. $\mathrm{V}=\frac{\sqrt{6}}{6}{\mathrm{a}}^3$

B. $\mathrm{V}=\frac{\sqrt{2}}{4}{\mathrm{a}}^3$

C. $\mathrm{V}=\frac{\sqrt{2}}{2}{\mathrm{a}}^3$

D. $\mathrm{V}=\frac{\sqrt{2}}{6}{\mathrm{a}}^3$

A. $\mathrm{h}=\frac{3}{7}\mathrm{a}$

B. $\mathrm{h}=\frac{2\sqrt{3}}{7}\mathrm{a}$

C. $\mathrm{h}=\frac{\sqrt{21}}{7}\mathrm{a}$

D. $\mathrm{h}=\frac{\sqrt{42}}{7}\mathrm{a}$

A. $k=\frac{1}{3}$

B. $k=\frac{2}{3}$

C. $k=\frac{3}{4}$

D. $k=1$

A. $k=\frac{1}{3}$

B. $k=\frac{2}{3}$

C. $k=\frac{3}{4}$

D. $k=1$

A. $\frac{4{\mathrm{a}}^3\sqrt{3}}{3}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

C. $\frac{2{\mathrm{a}}^3\sqrt{3}}{3}$

D. $\frac{2{\mathrm{a}}^3\sqrt{6}}{3}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

A. $\frac{{\mathrm{a}}^3\sqrt{2}}{2}$

B. $\frac{{\mathrm{a}}^3\sqrt{2}}{6}$

C. $\frac{{\mathrm{a}}^3\sqrt{2}}{3}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

A. $\mathrm{V}=8{\mathrm{a}}^3$

B. $\mathrm{V}=\frac{2{\mathrm{a}}^3}{3}$

C. $\mathrm{V}=\frac{9{\mathrm{a}}^3}{4}$

D. $\mathrm{V}={\mathrm{a}}^3$

A. $\frac{\sqrt{6}{\mathrm{a}}^3}{18}$

B. $\frac{2\sqrt{2}{\mathrm{a}}^3}{3}$

C. $\frac{{\mathrm{a}}^3}{3}$

D. $\frac{2{\mathrm{a}}^3}{3}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{6}}{24}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3}{8}$

A. $\frac{{\mathrm{a}}^3\sqrt{2}}{4}$

B. $\frac{{\mathrm{a}}^3\sqrt{2}}{6}$

C. $\frac{{\mathrm{a}}^3}{9}$

D. $\frac{{\mathrm{a}}^3\sqrt{2}}{2}$

A. 12

B. 24

C. $\frac{1}{12}$

D. $\frac{1}{24}$

A. ${\mathrm{a}}^3\sqrt{3}$

B. $\frac{3{\mathrm{a}}^3}{4}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

D. $\frac{3{\mathrm{a}}^3\sqrt{3}}{4}$

A. $\frac{{\mathrm{a}}^3\sqrt{6}}{4}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3}{3}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{2}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{2}}{6}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

A. $\frac{{\mathrm{a}}^3}{4}$

B. $\frac{{\mathrm{a}}^3}{12}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

B. $\frac{{\mathrm{a}}^3}{3}$

C.$\frac{{\mathrm{a}}^3}{9}$

D. ${\mathrm{a}}^3$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{12}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{3}$

C. $\mathrm{V}=\frac{2{\mathrm{a}}^3\sqrt{3}}{3}$

D. $\mathrm{V}={\mathrm{a}}^3$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{3}$

C. $\mathrm{V}=\frac{2{\mathrm{a}}^3\sqrt{3}}{3}$

D. $\mathrm{V}={\mathrm{a}}^3$

A. $\mathrm{V}=\frac{3{\mathrm{a}}^3\sqrt{3}}{4}$

B.$\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

A. $\mathrm{V}=\frac{\sqrt{5}}{24}$

B. $\mathrm{V}=\frac{\sqrt{15}}{24}$

C. $\mathrm{V}=\frac{\sqrt{15}}{8}$

D. $\mathrm{V}=\frac{\sqrt{15}}{12}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{5}}{8}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

A. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{16}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{16}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3}{8}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

A. $4\sqrt{3}$

B. $2\sqrt{3}$

C. 2

D. $\frac{4}{\sqrt{3}}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

C. $\frac{2{\mathrm{a}}^3\sqrt{3}}{3}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

A. ${\mathrm{a}}^3\sqrt{6}$

B. $\frac{{\mathrm{a}}^3\sqrt{6}}{12}$

C. $\frac{{\mathrm{a}}^3\sqrt{6}}{3}$

D. $\frac{{\mathrm{a}}^3\sqrt{6}}{6}$

A. $\frac{{\mathrm{a}}^3\sqrt{15}}{3}$

B. $\frac{{\mathrm{a}}^3\sqrt{15}}{4}$

C. $\frac{{\mathrm{a}}^3\sqrt{15}}{6}$

D. $\frac{{\mathrm{a}}^3\sqrt{15}}{12}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3}{3}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{9}$

C. $\mathrm{V}={\mathrm{a}}^3\sqrt{2}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3}{2}$

A. $\frac{{\mathrm{a}}^2\mathrm{b}}{4\sqrt{3}}$

B. $\frac{{\mathrm{a}}^2\mathrm{b}}{4}$

C. $\frac{{\mathrm{a}}^2\mathrm{b}}{2}$

D. $\frac{{\mathrm{a}}^2\mathrm{b}\sqrt{3}}{2}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3}{12}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{6}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3}{4}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3}{12}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{7}}{12}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3}{4}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

A. $\mathrm{V}=2{\mathrm{a}}^3\sqrt{6}$

B. $\mathrm{V}={\mathrm{a}}^3\sqrt{2}$

C. $\mathrm{V}=3{\mathrm{a}}^3\sqrt{2}$

D. $\mathrm{V}=\frac{3{\mathrm{a}}^3\sqrt{2}}{2}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

B. $\frac{3{\mathrm{a}}^3\sqrt{3}}{12}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

D. $\frac{3{\mathrm{a}}^3\sqrt{3}}{4}$

A. $\mathrm{V}=\frac{\sqrt{2}}{6}{\mathrm{a}}^3$

B. $\mathrm{V}=\frac{\sqrt{3}}{4}{\mathrm{a}}^3$

C. $\mathrm{V}=\frac{\sqrt{3}}{12}{\mathrm{a}}^3$

D. $\mathrm{V}=\frac{3\sqrt{3}}{4}{\mathrm{a}}^3$

A. $\frac{{\mathrm{a}}^2}{4}\sqrt{3{\mathrm{b}}^2-{\mathrm{a}}^2}$

B. $\frac{{\mathrm{a}}^2}{12}\sqrt{3{\mathrm{b}}^2-{\mathrm{a}}^2}$

C. $\frac{{\mathrm{a}}^2}{6}\sqrt{3{\mathrm{b}}^2-{\mathrm{a}}^2}$

D. ${\mathrm{a}}^2\sqrt{3{\mathrm{b}}^2-{\mathrm{a}}^2}$ 

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

B. $\frac{{\mathrm{a}}^3\sqrt{2}}{4}$

C. $\frac{{\mathrm{a}}^3\sqrt{2}}{2}$

D. $\frac{{\mathrm{a}}^3\sqrt{2}}{3}$

A. 20

B. 10

C. 15

D. 30

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

A. $\mathrm{V}=\frac{4{\mathrm{a}}^3}{15}$

B. $\mathrm{V}=\frac{8{\mathrm{a}}^3}{45}$

C. $\mathrm{V}=\frac{8{\mathrm{a}}^3}{15}$

D. $\mathrm{V}=\frac{4{\mathrm{a}}^3}{5}$

A. ${\mathrm{a}}^3\sqrt{2}$

B. $3{\mathrm{a}}^3$

C. ${\mathrm{a}}^3\sqrt{6}$

D. $3{\mathrm{a}}^3\sqrt{2}$

A. 4.

B. 2.

C. 3.

D. 1/2.

A. $\frac{{\mathrm{a}}^3\sqrt{6}}{12}$

B. $\frac{{\mathrm{a}}^3\sqrt{6}}{4}$

C. $\frac{{\mathrm{a}}^3\sqrt{2}}{6}$

D. $\frac{{\mathrm{a}}^3}{4}$

A. ${\mathrm{a}}^3$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

D. $\frac{{\mathrm{a}}^3}{3}$

A. $\frac{{\mathrm{a}}^3\sqrt{6}}{6}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

D. $\frac{{\mathrm{a}}^3\sqrt{6}}{2}$

A. $\frac{{\mathrm{a}}^3}{3}$

B. ${\mathrm{a}}^3$

C. $\frac{{\mathrm{a}}^3}{2}$

D. $\frac{3{\mathrm{a}}^3}{2}$

A. $\frac{{\mathrm{a}}^3\sqrt{2}}{3}$

B. $\frac{2{\mathrm{a}}^3}{3}$

C. ${\mathrm{a}}^3\sqrt{12}$

D. $\frac{{\mathrm{a}}^3}{3}$

A. ${\mathrm{a}}^3\sqrt{2}$

B. $3{\mathrm{a}}^3\sqrt{2}$

C. $3{\mathrm{a}}^3$

D. ${\mathrm{a}}^3\sqrt{6}$

A. ${\mathrm{a}}^3\sqrt{2}$

B. ${\mathrm{a}}^3\sqrt{6}$

C. $3{\mathrm{a}}^3$

D. $3{\mathrm{a}}^3\sqrt{2}$

A. $\frac{{\mathrm{a}}^3\sqrt{2}}{6}$

B. $\frac{{\mathrm{a}}^3\sqrt{2}}{2}$

C. $\frac{{\mathrm{a}}^3\sqrt{2}}{4}$

D. $\frac{{\mathrm{a}}^3\sqrt{2}}{12}$

A. $\mathrm{V}={\mathrm{a}}^3$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{2}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3}{3}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3}{6}$

A. $\frac{{\mathrm{a}}^3}{24}$

B. $\frac{3{\mathrm{a}}^3}{24}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

D. $\frac{{\mathrm{a}}^3\sqrt{2}}{24}$

A. $\mathrm{V}=\frac{\sqrt{2}}{4}$

B. $\mathrm{V}=\frac{\sqrt{3}}{2}$

C. $\mathrm{V}=\frac{\sqrt{2}}{2}$

D. $\mathrm{V}=\frac{\sqrt{3}}{4}$

A. $\frac{{\mathrm{a}}^3\sqrt{2}}{3}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

A. V = 6${\mathrm{V}}_1$

B. V = 4${\mathrm{V}}_1$

C. V = 3${\mathrm{V}}_1$

D. V = 2${\mathrm{V}}_1$

A. $\frac{{\mathrm{a}}^3\sqrt{2}}{2}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

C. ${\mathrm{a}}^3\sqrt{3}$

D. ${\mathrm{a}}^3\sqrt{2}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

A. $32{\mathrm{a}}^3\sqrt{3}$

B. $\frac{{\mathrm{a}}^3}{32}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{32}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{12}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

C. $\frac{3{\mathrm{a}}^3}{24}$

D. $\frac{{\mathrm{a}}^3\sqrt{5}}{24}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

B. $\frac{3{\mathrm{a}}^3\sqrt{3}}{4}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

D. $\frac{3{\mathrm{a}}^3\sqrt{3}}{8}$

A. $\frac{7{\mathrm{a}}^3\sqrt{6}}{2}$

B. $\frac{{\mathrm{a}}^3\sqrt{6}}{2}$

C. $\frac{9{\mathrm{a}}^3\sqrt{6}}{2}$

D. $\frac{{\mathrm{a}}^3\sqrt{6}}{6}$

A. $\frac{{\mathrm{a}}^3\sqrt{15}}{3}$

B. ${\mathrm{a}}^3\sqrt{6}$

C. $\frac{{\mathrm{a}}^3\sqrt{15}}{12}$

D. $\frac{{\mathrm{a}}^3\sqrt{15}}{24}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3}{2}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3}{4}$

C. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{4}$

D. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{2}$

A. ${\mathrm{a}}^3$

B. $\frac{{\mathrm{a}}^3\sqrt{21}}{7}$

C. ${\mathrm{a}}^3\sqrt{3}$

D. $\frac{{\mathrm{a}}^3\sqrt{3}}{3}$

A. $\mathrm{k}=\frac{3\mathrm{a}}{\sqrt{5}}$

B. $\mathrm{k}=\mathrm{a}\sqrt{\frac{3}{5}}$

C. $\mathrm{k}=\frac{2\mathrm{a}}{\sqrt{5}}$

C. $\mathrm{k}=\frac{2\mathrm{a}}{\sqrt{5}}$

A. $\frac{1}{2}$

B. $\frac{1}{3}$

C. $\frac{1}{4}$

D. $\frac{1}{5}$

A. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{32}$

B. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{16}$

C. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{4}$

D. $\mathrm{V}=\frac{3{\mathrm{a}}^3}{8}$

A. $\frac{4{\mathrm{a}}^3}{9}$

B. $\frac{19{\mathrm{a}}^3}{4}$

C. $\frac{9{\mathrm{a}}^3}{4}$

D. $\frac{4{\mathrm{a}}^3}{19}$

A. $\frac{{\mathrm{a}}^3}{2}$

B. $\frac{3{\mathrm{a}}^3}{4}$

C. $\frac{3{\mathrm{a}}^3}{16}$

D. $\frac{3{\mathrm{a}}^3}{2}$

A. $\frac{{\mathrm{a}}^3\sqrt{3}}{4}$

B. $\frac{{\mathrm{a}}^3\sqrt{3}}{6}$

C. $\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

D. $\frac{{\mathrm{a}}^3\sqrt{2}}{2}$

A. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{2}$

B. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{8}$

C. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{16}$

D. $\mathrm{V}=\frac{{\mathrm{a}}^3\sqrt{3}}{24}$

A. V = 12${\mathrm{a}}^3$

B. V = 3${\mathrm{a}}^3$

C. V = 9${\mathrm{a}}^3$

D. V = 6${\mathrm{a}}^3$