2020高三·全国·专题练习
解题方法
1 . 已知D,E,F分别为△ABC的边BC,CA,AB的中点,且
,
,给出下列命题:
①
;②
;③
;④
.
其中正确命题的序号为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f3d3d11e628c23ca94e505530520d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f0589298e015be01e2420268262f55.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d69ba4e18a823c1aec092bd22d3ddf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472048fe33dec80e399f952314e22a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4437d2b6a2784e19cf8a39aa48b8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f63be4bdb558d1795d0f50e1cd83697.png)
其中正确命题的序号为
您最近一年使用:0次
2 . 已知三角形
为等腰直角三角形,且
,有下列命题:①
;②
;③
;④
.其中正确命题的序号为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc1ba2766874730daaad7d3bb7a8ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6961e8add5f88c20a7d839df1c4a7955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0855de7ada593ff612e1281deb89130e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819369f6336456b815a8581e37613476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a561bbe2fe5d7a9f8dbd1a7e2399e3df.png)
您最近一年使用:0次
2019-12-05更新
|
428次组卷
|
2卷引用:人教B版(2019) 必修第二册 过关斩将 第六章 6.1.3 向量的减法
3 .
分别为
的边
的中点,且
,
,给出下列结论:
①
;②
;
③
;④
.
其中所有正确结论的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c74d6f8ca63565d9e79073e50ff47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75fe1c19db7ccec10fee3edc2385215f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7009c25899887e6df12cbc80034cb39f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84eca96d76aebf52827bb14b41c22fd.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09243907d75f2ff36334a6ae9ef0c2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd878e4a202aed5cb1cf20541c85ed5.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c55733f82695eff7f2286cd3d9d2f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc85bbf3aabc67a8597166f9d743845.png)
其中所有正确结论的序号为
您最近一年使用:0次
2019-10-09更新
|
1044次组卷
|
2卷引用:人教A版 必杀技 第二章 平面向量 2.3.1平面向量基本定理
4 . 已知点D,E,F分别为△ABC的边BC,CA,AB的中点,且
=
,
=
,给出下列命题:
①
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
-
; ②
=
+![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
;
③
=-![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
+![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
; ④
+
+
=0.
其中正确命题的序号为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbce33d610dc616d4b1076194745ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b624db1eb415063a69c84f6dc07de05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5fe80687551fd69359120ebdd4a45fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.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/4616054315c593433845f296222bb637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d229fb1c526050f42d65572510b2fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5fe80687551fd69359120ebdd4a45fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4616054315c593433845f296222bb637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d229fb1c526050f42d65572510b2fef.png)
其中正确命题的序号为
您最近一年使用:0次