1 . 如图,在
中,D为BC的中点,G为AD的中点,过点G任作一直线MN分别交AB,AC于M,N两点,若
,
,试问:
是否为定值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a398a79942d381cab12d13bf4028d5ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b84e1b1028bc6b7432d4262251aa29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0b84ee4ed90face0993d4f4dda379.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/5c2830df-cb47-4b61-9e58-cc79a39552db.png?resizew=149)
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2019-05-17更新
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431次组卷
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2卷引用:步步高高一数学暑假作业:作业24 平面向量基本定理及坐标表示