作业帮求教 2.如图,D是△ABC的边AB的三等分点,则向→量 →CD等于A,→CA+2/3→AB B →CA+1/3→AB C →CB+2/3→AB D →CB+1/3→AB http://hiphotos.baidu.com/%BD%F9%BE%C3%C4%FE/abpic/item/80999a1dbea5497942a9ad0b.jpg
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求教 2.如图,D是△ABC的边AB的三等分点,则向→量 →CD等于A,→CA+2/3→AB B →CA+1/3→AB C →CB+2/3→AB D →CB+1/3→AB http://hiphotos.baidu.com/%BD%F9%BE%C3%C4%FE/abpic/item/80999a1dbea5497942a9ad0b.jpg
求教
2.如图,D是△ABC的边AB的三等分点,则向→量 →CD等于
A,→CA+2/3→AB B →CA+1/3→AB C →CB+2/3→AB D →CB+1/3→AB
http://hiphotos.baidu.com/%BD%F9%BE%C3%C4%FE/abpic/item/80999a1dbea5497942a9ad0b.jpg
求教 2.如图,D是△ABC的边AB的三等分点,则向→量 →CD等于A,→CA+2/3→AB B →CA+1/3→AB C →CB+2/3→AB D →CB+1/3→AB http://hiphotos.baidu.com/%BD%F9%BE%C3%C4%FE/abpic/item/80999a1dbea5497942a9ad0b.jpg
B →CA+1/3→AB