解题方法
1 . 已知O是坐标原点,平面向量
,
,
,且
,
,
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95dc642eb6d03682732229852d337d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98efe3f981c7b6524a9cff7381624b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75561ca2ccf1fc9a938d4ce0891712d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c368da1c5238e33243ad8d4fb66b3d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc35e3d58a9532b08f518e88f70263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
A.![]() |
B.![]() |
C.若![]() |
D.若![]() ![]() ![]() |
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2 . 如图,在梯形
中,
,
分别为
的中点,
是线段
上的动点.
,求证:
三点共线;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1e9852d91e57480159b422f5238995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b96dce1ec94eb90c243b2eddb78476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830a2b1de770f4363ac9ef139bcf5c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1b238617cfc627e8f79d94bb01735d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1c6a335cc8c87b8e906d7726bb35baf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e5837694793b1861a1c339c813a02f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335b95166f0137fa89da25c43d343336.png)
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名校
解题方法
3 . 已知O是
所在平面内一点,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若O为![]() ![]() ![]() |
D.若![]() ![]() |
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4 . 如图所示,
是
的中点,
是平行四边形
内(含边界)的一点,且
,则当
时,
的范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1084efdbd3d24b1dbdfaef9925042e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c83ae9269c4cf914b9f9bb41982cf02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107babba45f110012183dc4dc54490f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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5 . 如图,在
中,E,H分别是AD,BC的中点,
,G为DF与BE的交点.
,
,试以向量
,
为基底表示
,
;
(2)若
,求m,n的值;
(3)求证:A,G,H三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade0c328cc3442c26e5bf33d9134c071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e984585ddf28c039219afcebf229de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33a112e9728d7b560199765c815f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf814115dc9fea36cc1b6cd2b293390.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3627d58beaad56cfb8525ddee3492c39.png)
(3)求证:A,G,H三点共线.
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解题方法
6 . 如图,已知
的两边
、
的中点分别为M、N,在
延长线上取点P,使
,在
的延长线上取点Q,使
.试用向量方法证明:F、A、Q三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662b342c0fc78fdbcf2e55af422ba5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7302e3cfc33bdb4f27c5d82d8c81984b.png)
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解题方法
7 . 已知
、
是两个不平行的向量,向量
,
,
,求证:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bb7dce9fe85d34d6b91fb143596bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ce72b37d620fb78c3324af7908d3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fde7e318894d844216aadc81ed8d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb452339f63edb5369b899addce5b68.png)
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8 . 如图,在
中,已知
,
,试判断向量
与向量
是否共线,并简述理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4222aef8de0977dc23f46c4b5efaa1dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9732c1c2fe551adb2eb30fcc49a988a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d021a5c98388463d577675e58068aa7.png)
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9 . 已知向量
,
.
(1)求
;
(2)若
,
,
,求证:
,
,
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e3b305d46c3e71fead9f4988cf2a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce6db88d0486f8615f0efc741186fe7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6849424bb49758b9c55fec214eef565.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea4939931d004b13221ecd6f38fb81d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699758292f8a642180d9cb66a20e42e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f5f060712adb92db0cb374ee251fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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10 . 设平面内不相同的四点A、B、C、D,判断下列结论是否正确,并说明理由.
(1)若
,则A、B、C三点共线;
(2)若
,则A、B、C、D四点共线.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922ace9e17f534a1360f8f1c16e7de6c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdeb8cfadb41d94aaa1ba534aa040dcd.png)
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