<p>若平面向量<img src="https://file.gaojiufeng.cn/learnAppQuestion/54/9a/549aa7c71d6b30c5f0026910215ca9cc.jpg" style="width: 100%;height: auto;">且<img src="https://file.gaojiufeng.cn/learnAppQuestion/9b/cd/9bcd37cfa5d15007264e9c32182e6ba9.jpg" style="width: 100%;height: auto;">则<img src="https://file.gaojiufeng.cn/learnAppQuestion/0d/0b/0d0bf0b4b259e2e26e93d187c78252a2.jpg" style="width: 100%;height: auto;">____