单选题 较易0.85 引用1 组卷154
在平面直角坐标系xOy中,已知四边形ABCD是平行四边形,
=(1,-2),
=(2,1),则
·
等于( )
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096489302573056/2100062641979393/STEM/07e2ab3f331b42ba87ecea8a8c33c847.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096489302573056/2100062641979393/STEM/0a5f1b8f49f843b78f96bb1e2584a9e5.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096489302573056/2100062641979393/STEM/0a5f1b8f49f843b78f96bb1e2584a9e5.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096489302573056/2100062641979393/STEM/79ae486feb2444a9829d01fa176bd604.png?resizew=14)
A.5 | B.4 |
C.3 | D.2 |
2019高三·全国·专题练习
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A.5 | B.4 |
C.3 | D.2 |
组卷网是一个信息分享及获取的平台,不能确保所有知识产权权属清晰,如您发现相关试题侵犯您的合法权益,请联系组卷网