Hỏi đáp về Chương I Vectơ

A.\(\dfrac{{3a}}{2}\)

B. \(\dfrac{a}{2}\)

C. \(\dfrac{{2a\sqrt 3 }}{3}\)

D. \(\dfrac{{a\sqrt 7 }}{2}\)

A.\(\overrightarrow {AM}  = \dfrac{1 }{ 3}\overrightarrow {AB}  + \overrightarrow {AC} \)

B.\(\overrightarrow {AM}  = \dfrac{1 }{3}\overrightarrow {AB}  + \dfrac{2 }{ 3}\overrightarrow {AC} \)

C.\(\overrightarrow {AM}  = \dfrac{1 }{3}\overrightarrow {AB}  + \dfrac{1 }{ 3}\overrightarrow {AC} \)

D.\(\overrightarrow {AM}  = \dfrac{1 }{3}\overrightarrow {AB}  + 2\overrightarrow {AC} \)

A.\(\overrightarrow {AI}  = \dfrac{1 }{ 2}\overrightarrow {AB}  + \dfrac{1 }{ 2}\overrightarrow {AC} \)

B.\(\overrightarrow {AI}  = \dfrac{1 }{3}\overrightarrow {AB}  + \dfrac{1 }{3}\overrightarrow {AD} \)

C.\(\overrightarrow {AI}  = \dfrac{1 }{2}\overrightarrow {AB}  + \dfrac{1 }{ 2}\overrightarrow {AD} \)

D.\(\overrightarrow {AI}  = \dfrac{1 }{ 2}\overrightarrow {AB}  + \overrightarrow {BI} \)

A.\(\overrightarrow {GA}  + \overrightarrow {GB}  + \overrightarrow {GC}  = \overrightarrow 0 \)

B.\(\overrightarrow {AB}  + \overrightarrow {AC}  = 2\overrightarrow {AM} \)

C.\(\overrightarrow {GB}  + \overrightarrow {GC}  = 2\overrightarrow {GM} \)

D.\(\overrightarrow {BM}  + \overrightarrow {MC}  = \overrightarrow 0 \)

A. \(\overrightarrow {PM}  =  - \overrightarrow {PN} \)

B. \( PM=PN\)

C. \(\overrightarrow {PM}  = \overrightarrow {PN} \)

D. \(\overrightarrow {MP}  = \overrightarrow {NP} \)

A.\(\overrightarrow {AB}  =  - \overrightarrow {BC} \)            

B.\(\overrightarrow {AD}  =  - \overrightarrow {BC} \)                

C.\(\overrightarrow {AC}  =  - \overrightarrow {BD} \)            

D.\(\overrightarrow {AD}  =  - \overrightarrow {CB} \)

A.\(\overrightarrow {AB}  - \overrightarrow {BC}  = \overrightarrow {AC} \)          

B.\(\overrightarrow {AB}  + \overrightarrow {BC}  = \overrightarrow {AC} \)

C.\(\overrightarrow {BC}  + \overrightarrow {AB}  = \overrightarrow {AC} \)

D.\(\overrightarrow {BC}  - \overrightarrow {BA}  = \overrightarrow {AC} \)

A.\(\overrightarrow {BP} \)       

B.\(\overrightarrow {MA} \)                          

C.\(\overrightarrow {PC} \)       

D.\(\overrightarrow {PB} \)