已知P是
所在平面外一点,M是PC中点,且
,求x,y,z的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e41158c2bf7a2e9d0976707156bd.png)
20-21高二·江苏·课后作业 查看更多[3]
更新时间:2021-12-04 23:14:54
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相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】如图,两条相交成
角的直路EF、MN,交点是O,一开始,甲在OE上距O点2km的点A处,乙在OM上距O点1km的点B处,现在他们同时以2km/h的速度行走,且甲沿EF方向,乙沿NM的方向,设OE同向的单位向量为
设OM同向的单位向量为
.
![](https://img.xkw.com/dksih/QBM/2021/1/10/2633322377871360/2636683484635136/STEM/826bf1b2-100d-4680-924d-6e932c012b16.png)
(1)若过2小时后,甲到达C点,乙到达D点,请用
表示
;
(2)若过t小时后,甲到达G点,乙到达H点,请用
表示
;
(3)什么时间两人间距最短?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2d8e38585b00fe278e88f520cd9bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
![](https://img.xkw.com/dksih/QBM/2021/1/10/2633322377871360/2636683484635136/STEM/826bf1b2-100d-4680-924d-6e932c012b16.png)
(1)若过2小时后,甲到达C点,乙到达D点,请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111939547e581e8bf029a241b9e9cb05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed9c2e9fabbfc63733bae8fa079d00.png)
(2)若过t小时后,甲到达G点,乙到达H点,请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2e171bd6ea8af73929c439a4e5cf8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21162e18e3c389215ac1a44858d6c5a7.png)
(3)什么时间两人间距最短?
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解答题-问答题
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较易
(0.85)
解题方法
【推荐2】在平行四边形
中,
与
交于点
是线段
的中点,
的延长线与
交于点F.若
,
,试用基底
分别表示下列向量:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e7f10e0c8af2d0d02a685f6f19e329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1887a1513aee097a396e99d7399c4e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3afb528b6095c9db39b8aa899a33427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd717cdaa2d82f8d3856c07402fd78a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00b863991d441829e9ccbc21a796301.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d538446124353976bb32f44a45635c.png)
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