1 . 若
,则A,B,C,D四点共线.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da65df9df70430d0a095297a628f04c.png)
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2 . 四点A,B,C,D构成平行四边形ABCD的充要条件是
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da65df9df70430d0a095297a628f04c.png)
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3 . 判断对错
1.空间直角坐标系中,在x轴上的点的坐标一定是(0,b,c)的形式.( )
2.空间直角坐标系中,在xOz平面内的点的坐标一定是(a,0,c)的形式.( )
3.关于坐标平面yOz对称的点其纵坐标、竖坐标保持不变,横坐标相反.( )
1.空间直角坐标系中,在x轴上的点的坐标一定是(0,b,c)的形式.
2.空间直角坐标系中,在xOz平面内的点的坐标一定是(a,0,c)的形式.
3.关于坐标平面yOz对称的点其纵坐标、竖坐标保持不变,横坐标相反.
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4 . 若
,则λ=0或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57a47c35195783f2eba8c6fd6649594.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ebb215e473c34199bff42cc214cd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57a47c35195783f2eba8c6fd6649594.png)
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5 . 若
,则
或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecfaf651f46c6915a3f463d67ec0e5c.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d3040f7af309b4d9d4bca7ef97f804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ce380bce6978d2acd0742bed4e98e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecfaf651f46c6915a3f463d67ec0e5c.png)
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6 . 若
,则
或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32112e7ad1091ae2da4009eec3610e49.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7677fa4ecba4dd4005f5a1b52cf86b82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57a47c35195783f2eba8c6fd6649594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32112e7ad1091ae2da4009eec3610e49.png)
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7 . 向量
与
的夹角等于向量
与
的夹角( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed9c2e9fabbfc63733bae8fa079d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdc83becc28e0f43d71427d9e8775d4.png)
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8 . 对于非零向量
,由
,可得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec6df8a1e8ccc7a0dc182efa0a53cdb.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dfd95b2e1d2c7f2a85fffe24f62686d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec6df8a1e8ccc7a0dc182efa0a53cdb.png)
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9 . 对任意向量
,
,满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8816c411e16de160b34eff77a235ccb.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8816c411e16de160b34eff77a235ccb.png)
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10 . 对于向量
,
,
,有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689a5623593592bcdee96e8690c2beb2.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689a5623593592bcdee96e8690c2beb2.png)
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