在
中,
,
,AD交BE于点G,设
,
.
(1)用
,
表示
,
;
(2)若
,
,
,
夹角为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ab4e2ff4836c461ba556721b6f9926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21370b099839b61e81cd4cf7ef7e3818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc03a3ba496faee748a8d63e5d4fa92.png)
(1)用
![](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/304a7f07db2ec637baadf8f0ab91c85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33a112e9728d7b560199765c815f69.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa3610a990287d3ac756abae406540d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361357baa2ad35705250c063ef6707d2.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/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62683c5dd9eedf10b547b429dd57ed9c.png)
更新时间:2023-07-03 13:58:37
|
相似题推荐
解答题-计算题
|
适中
(0.65)
【推荐1】已知
是平行六面体.
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879456882802688/2880088963874816/STEM/5d08b7d48a7b4cee914ba0cfc4ca11ce.png?resizew=155)
(1)化简
,并在图中标出其结果;
(2)设M是底面ABCD的中心,N是侧面
对角线
上靠近
的四等分点,设
,试求的
,
,
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879456882802688/2880088963874816/STEM/5d08b7d48a7b4cee914ba0cfc4ca11ce.png?resizew=155)
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8234dc20e07ebe26f22025b73bb25cce.png)
(2)设M是底面ABCD的中心,N是侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545decfe4dd2dcf6f24da7363c1bd023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f45d6d79aac963f8f473b77c21ca755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
您最近一年使用:0次
【推荐2】在
中,角A,B,C的对边分别为a,b,c,满足
.
(1)求角
;
(2)若点
在边
上,
是
的平分线,
且
与
的面积之比为
,求边
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13d68d24f5442316690ecbe5af8d8e4.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84783b6ba0f36789519816101a437f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图,在中,
,
,点D,E分别在AB,AC上且满足
,
,点F在线段DE上.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9023a0297f4d7a5eb085df96be4b3de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d463b66eacd0205c0f1301dbb8d9aa91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a989aa942219970ec11ccd6ab186d69b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca9839fb275ef28c489bd8bb4b120fe.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在平行四边形
中,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/68d85c32-c2a7-40eb-99a5-8c42c7f7b807.png?resizew=199)
(1)试用向量
表示向量
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa85a8c7deb1370bdec09e1bcacbe891.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/68d85c32-c2a7-40eb-99a5-8c42c7f7b807.png?resizew=199)
(1)试用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b704dc322a545a3ebf6979900d13c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd9e7ed21b7e6f315ec372c49f25498.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9916354bf269cbfc35ad3d4dcf1f41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cb34c62f897aa82ef66df42e05a30f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】(1)在直角坐标系
中,已知点
,
,
,点
在
三边围成的区域(含边界)上.若
,求
;
(2)在平行四边形
中,
,
,连接
、
相交于点
,若
,求实数
与
的乘积.
![](https://img.xkw.com/dksih/QBM/2017/11/14/1817079258783744/1818439297310720/STEM/8c3d78be78564bc4b44526c759d309fd.png?resizew=277)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8520a14da6394d9cbdb3ce781cff511b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9827b42f7084defde57776a438eefa9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d3c69008009bed1a23c397fb7b99be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d003027095df9b8db1eef1345bc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07bf7608da5d60e31c0973fd8ac2ecb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02f2232f758f277a7449faba0871c04.png)
(2)在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6335eb644513a522541b9542970e2469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e0f95d849659f39e51a1a825bdb90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21cd65e6f7ff425035aead4203b3a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://img.xkw.com/dksih/QBM/2017/11/14/1817079258783744/1818439297310720/STEM/8c3d78be78564bc4b44526c759d309fd.png?resizew=277)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图所示,在
中,
,
,
,
分别为线段
,
上一点,且
,
,
和
相交于点
.
![](https://img.xkw.com/dksih/QBM/2021/3/9/2674076204646400/2675076470857728/STEM/6d63a5fff8be4601b5851e401a914d3e.png?resizew=259)
(1)用向量
,
表示
;
(2)假设
,用向量
,
表示
并求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae60c09521904ab969829bf0d74edd37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b6bef27de230acad352f25e954f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d127d5639a8b81a93d75ff4626060c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/3/9/2674076204646400/2675076470857728/STEM/6d63a5fff8be4601b5851e401a914d3e.png?resizew=259)
(1)用向量
![](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/205b7476ab0bad9c1e79ef0c74dbd703.png)
(2)假设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e6ee24d77bfa77c4798c0745a20056.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/f75fc81977aee721525b4c5625f5a097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】已知
,
,
.
(1)求
;
(2)求向量
与
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fc7a342293983cc4865498c121493d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0030e7be6d3f4ff2a7982d507e859b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf26dc4c8ad920dd1f067f174c63e992.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efc342fe2e7c9e0ce7a836e512ef389.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed492f7b29166ba5c1f0023b05a439c5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】在
中,设
,
(1)求证:
;
(2)若
,且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42f8a2bc3d6e06dbf4d430321104800.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0176643acad66df65b23a1c8da0d0c6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8d53ab52a44d0fc6b3610e16afe034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ccfcbb1bfdaaf0d4abbdcd1af264bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de337d21ecd7e19830c14f72fba4ad40.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知向量
,
满足
,
,且
.
(1)求
;
(2)在
中,若
,
,求|
|.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ae0d7b3266f32b6a916b6237b6b838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b311957e153c4ebb3c77fbd58e3a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270b2b5c1d0d65431dd31d7e672f9611.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daef91a6dc58061db290e3264716e0c7.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b9d8a08fc52c31cc1a7f527d18b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f386f5b56b07b96f2600da1be15414a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89265cbe3abc6b966ce8967fead448b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】已知向量
与
满足
,且
.
(1)求
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2df38e5182c635c363b564a11fbe40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a26db5420c55daf2013920ae45993b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9168302a857504c7f5651d59e11594e1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3f64e7746530858bb6cd628111bcdb.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐3】已知平面向量
,
,若
,
,
.
(1)求
的值;
(2)设
,
,求
的值.
![](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/9936a46cc891744d4600f76bb92b694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3ef7880a91fa1f4261db80266a0abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0f524cc0d04a4d11f4ee0ada2a4286.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9667f6c0eac65be9c5e10f966af41f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507fb574e63800850eba91eee67096cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f45b3fc0d792869760a4f219b70de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/725e5d3115afca19c1478e1f8e3e6c3b.png)
您最近一年使用:0次