A:(2016,1)
B:(2016,0)
C:(2016,﹣1)
D:(2016π,0)
下面对《陋室铭》内容和写法分析理解不正确的一项是( )
已知a→=(2,1),b→=(﹣3,﹣4),
(1)求2a→+3b→,|a→﹣2b→|;
(2)求a→与b→的夹角的余弦值.
阅读下面的内容,按要求完成任务。
Mind maps are a great way of showing a picture of information.They work very well in all kinds of learning.Here is an example to show us how to draw a mind map.
To make the mind map even better,use color to show important ideas or parts of the map.