20 câu trắc nghiệm Toán 11 Chân trời sáng tạo Cấp số nhân có đáp án

A. \[{\rm{128;}} - {\rm{64; 32;}} - {\rm{16;}} - {\rm{8; }}...\]

B. \[\sqrt {\rm{2}} {\rm{; 2; 4; 4}}\sqrt {\rm{2}} {\rm{; }}...\]

C. \[{\rm{5; 6; 7; 8; }}...\]

D. \[{\rm{15; 5; 1; }}\frac{{\rm{1}}}{{\rm{5}}}{\rm{; }}...\]

A. 11

B. 12

C. 10

D. 13

A. \[{\rm{x = }} - 6\]

B. \[{\rm{x = }} - \frac{{13}}{2}\]

C. \[{\rm{x = }} \pm 6\]

D. x = 36

A. \[{{\rm{u}}_{\rm{n}}}{\rm{ = }} - \frac{{\rm{1}}}{{{{\rm{2}}^{\rm{n}}}}}\]

B. \[{{\rm{u}}_{\rm{n}}}{\rm{ = }}{{\rm{2}}^{{\rm{n}} - {\rm{2}}}}\]

C. \[{{\rm{u}}_{\rm{n}}}{\rm{ = }} - {{\rm{2}}^{{\rm{n}} - {\rm{1}}}}\]

D. \[{{\rm{u}}_{\rm{n}}}{\rm{ = }} - \frac{{\rm{1}}}{{{{\rm{2}}^{{\rm{n}} - {\rm{1}}}}}}\]

A. \[\frac{{{{10}^{\rm{n}}} - 1}}{9}\]

B. \[10\left( {\frac{{{{10}^{\rm{n}}} - 1}}{9}} \right)\]

C. \[\left[ {10\left( {\frac{{{{10}^{\rm{n}}} - 1}}{9}} \right) - {\rm{n}}} \right]\]

D. \[10\left( {\frac{{{{10}^{\rm{n}}} - 1}}{9}} \right) + n\]

A. P = 1

B. P = 2

C. P = 3

D. P = 4

A. 56⁰

B. 102⁰

C. 252⁰

D. 168⁰

A. 6 m²

B. 8 m²

C. 10 m²

D. 12 m²

A. −2; 10; 50; −250

B. −2; 10; −50; 250

C. −2; −10; −50; −250

D. −2; 10; 50; 250

A. \[{{\rm{u}}_{\rm{k}}}{\rm{ = }}{{\rm{u}}_{\rm{1}}}{\rm{ + }}\left( {{\rm{k}} - {\rm{1}}} \right){\rm{q}}\]

B. \[{{\rm{u}}_{\rm{k}}}{\rm{ = }}{{\rm{u}}_{\rm{1}}}{\rm{ + }}\left( {{\rm{k}} - {\rm{1}}} \right){\rm{q}}\]

C. \[{{\rm{u}}_{\rm{k}}}{\rm{ = }}\frac{{{{\rm{u}}_{{\rm{k}} - {\rm{1}}}}{\rm{ + }}{{\rm{u}}_{{\rm{k + 1}}}}}}{{\rm{2}}}\]

D. \[{{\rm{u}}_{\rm{k}}}{\rm{ = }}{{\rm{u}}_{\rm{1}}}{\rm{.}}{{\rm{q}}^{{\rm{k}} - {\rm{1}}}}\]

A. \(\left\{ {\begin{array}{*{20}{c}}{{\rm{x = 6}}}\\{{\rm{y = }} - 54}\end{array}} \right.\)

B. \(\left\{ {\begin{array}{*{20}{c}}{{\rm{x = }} - 10}\\{{\rm{y = }} - 26}\end{array}} \right.\)

C. \(\left\{ {\begin{array}{*{20}{c}}{{\rm{x = }} - 6}\\{{\rm{y = }} - 54}\end{array}} \right.\)

D. \(\left\{ {\begin{array}{*{20}{c}}{{\rm{x = }} - {\rm{6}}}\\{{\rm{y = }}54}\end{array}} \right.\)

A. \(\left\{ {\begin{array}{*{20}{c}}{{{\rm{u}}_{\rm{1}}}{\rm{ = 5}}}\\{{\rm{q = 2}}}\end{array}} \right.\)

B. \(\left\{ {\begin{array}{*{20}{c}}{{{\rm{u}}_{\rm{1}}}{\rm{ = 6}}}\\{{\rm{q = 2}}}\end{array}} \right.\)

C. \(\left\{ {\begin{array}{*{20}{c}}{{{\rm{u}}_{\rm{1}}}{\rm{ = 9}}}\\{{\rm{q = 2}}}\end{array}} \right.\)

D. \(\left\{ {\begin{array}{*{20}{c}}{{{\rm{u}}_{\rm{1}}}{\rm{ = 9}}}\\{{\rm{q = 3}}}\end{array}} \right.\)

A. \[{{\rm{u}}_{\rm{n}}}{\rm{ = 7}} - {\rm{3n}}\]

B. \[{{\rm{u}}_{\rm{n}}}{\rm{ = 7}} - {{\rm{3}}^{\rm{n}}}\]

C. \[{{\rm{u}}_{\rm{n}}}{\rm{ = }}\frac{{\rm{7}}}{{{\rm{3n}}}}\]

D. \[{{\rm{u}}_{\rm{n}}}{\rm{ = 7}}{\rm{.}}{{\rm{3}}^{\rm{n}}}\]

A. 32

B. 104

C. 48

D. 96

B. \[{\rm{S = 2016 + 3}}{\rm{.}}{{\rm{4}}^{{\rm{2018}}}}\]

C. \[{\rm{S = 2015 + 3}}{\rm{.}}{{\rm{4}}^{{\rm{2017}}}}\]

D. \[{\rm{S = 2015}} - {\rm{3}}{\rm{.}}{{\rm{4}}^{{\rm{2017}}}}\]

A. \[\frac{{\rm{1}}}{{{{\rm{a}}^{\rm{2}}}}}{\rm{ = }}\frac{{\rm{1}}}{{{\rm{bc}}}}\]

B. \[\frac{{\rm{1}}}{{{{\rm{b}}^{\rm{2}}}}}{\rm{ = }}\frac{{\rm{1}}}{{{\rm{ac}}}}\]

C. \[\frac{{\rm{1}}}{{{{\rm{c}}^{\rm{2}}}}}{\rm{ = }}\frac{{\rm{1}}}{{{\rm{ab}}}}\]

D. \[\frac{{\rm{1}}}{{\rm{a}}}{\rm{ + }}\frac{{\rm{1}}}{{\rm{b}}}{\rm{ = }}\frac{{\rm{2}}}{{\rm{c}}}\]

A. \[\frac{{\sqrt 3 }}{2}\]

B. \[ - \frac{{\sqrt 3 }}{2}\]

C. \[\frac{1}{2}\]

D. \[ - \frac{1}{2}\]

A. \[{2^{\rm{n}}} - 1\]

B. \[\frac{1}{2}.\frac{{\frac{1}{{{2^{\rm{n}}}}} - 1}}{{\frac{1}{2} - 1}}\]

C. 2

D. 4

A. q = 2

B. q = – 2

C. \[{\rm{q = }} - \frac{3}{2}\]

D. \[{\rm{q = }}\frac{{\rm{3}}}{{\rm{2}}}\]

A. m = 3

B. m = −4

C. m = 1

D. m = −3