解题方法
1 .
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb9bb53d5d9b86e395398291c1b30b8.png)
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2 . 一个重为4N的物体,受到两个大小分别为2N,5N的力的作用,则物体所受合力大小的范围是________ .
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20-21高一·全国·课后作业
3 . 如图,C,D是△AOB中边AB的三等分点,设
=
,
=
,以{
,
}为基底来表示
=____ ,
=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfde0038de382d2be9701cea23ef7eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bd8a052e56b53a66497b4b55a968a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329fdf7d989f77a32ca9e0361a9cc956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc155e36276a2226c40a1f4ef7a0f41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bd8a052e56b53a66497b4b55a968a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc155e36276a2226c40a1f4ef7a0f41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4407c0b2e5febf70f610bd00067f105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10c8b60c45bdd5a49b5c130e755d9e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/c4b9974b-2812-4ceb-9078-211333ce81c8.png?resizew=164)
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