ÌâÄ¿ÄÚÈÝ
11£®µ±|$\overrightarrow{a}$|=|$\overrightarrow{b}$|¡Ù0£¬ÇÒ$\overrightarrow{a}$£¬$\overrightarrow{b}$²»¹²Ïßʱ£¬$\overrightarrow{a}$+$\overrightarrow{b}$Óë$\overrightarrow{a}$-$\overrightarrow{b}$µÄ¹ØÏµÊÇ£¨¡¡¡¡£©| A£® | ´¹Ö± | B£® | ²»´¹Ö± | C£® | ¹²Ïß | D£® | ÎÞ·¨È·¶¨ |
·ÖÎö ÔËÓÃÏòÁ¿µÄÊýÁ¿»ýµÄÐÔÖÊ£¬¼ÆËã$\overrightarrow{a}$+$\overrightarrow{b}$Óë$\overrightarrow{a}$-$\overrightarrow{b}$µÄÊýÁ¿»ý£¬¼´¿ÉÅжÏËüÃǵĹØÏµ£®
½â´ð ½â£ºÓÉÓÚ|$\overrightarrow{a}$|=|$\overrightarrow{b}$|¡Ù0£¬ÇÒ$\overrightarrow{a}$£¬$\overrightarrow{b}$²»¹²Ïßʱ£¬
¼´ÓУ¨$\overrightarrow{a}$+$\overrightarrow{b}$£©•£¨$\overrightarrow{a}$-$\overrightarrow{b}$£©=$\overrightarrow{a}$2-$\overrightarrow{b}$2=|$\overrightarrow{a}$|2-|$\overrightarrow{b}$|2=0£¬
Ôò£¨$\overrightarrow{a}$+$\overrightarrow{b}$£©¡Í£¨$\overrightarrow{a}$-$\overrightarrow{b}$£©£®
¹ÊÑ¡£ºA£®
µãÆÀ ±¾Ì⿼²éÏòÁ¿ÊýÁ¿»ýµÄÐÔÖÊ£¬Ö÷Òª¿¼²éÏòÁ¿´¹Ö±µÄÌõ¼þ£¬ÊôÓÚ»ù´¡Ì⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
6£®ÏÂÃæ½áÂÛÖдíÎóµÄÊÇ£¨¡¡¡¡£©
| A£® | ¾ßÓз½ÏòµÄÏ߶νÐÓÐÏòÏß¶Î | B£® | Á½¸ö¹²ÏßÏòÁ¿µÄ·½ÏòÏàͬ | ||
| C£® | ͬÏòÇҵȳ¤µÄÓÐÏòÏ߶αíʾͬÏòÁ¿ | D£® | ÁãÏòÁ¿µÄ·½Ïò²»È·¶¨ |
1£®$\frac{26}{3}$¦ÐÊÇ£¨¡¡¡¡£©
| A£® | µÚÒ»ÏóÏÞµÄ½Ç | B£® | µÚ¶þÏóÏÞµÄ½Ç | C£® | µÚÈýÏóÏÞµÄ½Ç | D£® | µÚËÄÏóÏÞµÄ½Ç |