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                # 點在平面內的分解 &emsp;&emsp;平面內點坐標的分解要做的就是根據平面內點集的表達式和平面內一點P,將P分解得到的兩個基向量的分量。下面是推導過程。 :-: ![](https://box.kancloud.cn/11c43c3edf1019a4ac60f6fa1076cf3c_1300x838.png) &emsp;&emsp;同理可以計算![](https://box.kancloud.cn/2ececa93bd40c04118659984c7ec249b_50x50.png =25x25)的值,讀者可以自行推導。
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