在△ABC中， AD→ =2 DC→ ， BA→ = a→ ， BD→ = b→ ， BC→ = c→ ，则下列等式成立的是

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在△ABC中， AD→ =2 DC→ ， BA→ = a→ ， BD→ = b→ ， BC→ = c→ ，则下列等式成立的是（）

A： $\vec{c}$ =2 $\vec{b}$ ﹣ $\vec{a}$

B： $\vec{c}$ =2 $\vec{a}$ ﹣ $\vec{b}$

C： $\vec{c}$ = $\frac{3 \vec{a}}{2}$ ﹣ $\frac{\vec{b}}{2}$

D： $\vec{c}$ = $\frac{3 \vec{b}}{2}$ ﹣ $\frac{\vec{a}}{2}$

上一题下一题 0.0难度选择题更新时间:2019-11-27 08:24:43

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D

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阅读下面短文，根据句意或提示，在空格处填入一个适当的词，每空一词。

Do you know Jay Chou? If you like watching "the Voice of China" this ____ /'sΛmә/, you must know him. Jay is a very popular singer in China. Jay is his ____ name and Chou is his last name. He is thirty-seven ____ old. His was *born on January 18th. He is f____ Taiwan. His favourite sport is ____, so he plays basketball every day. And his favourite ____ is blue. He can sing ____ write songs very well. Many people like ____ (listen) to his music. He is also a good teacher at the Voice of China on Zhejiang TV, because he helps his s____ a lot. Chen Zitong and Leon Lee ____ (be) two good students in his team.

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