已知向量<img src="https://zk.995w.com/lqwvjeImg/ad/ada1bca16f4cc76b2485198ed0a7bee6.png">的模分别是<img src="https://zk.995w.com/lqwvjeImg/f8/f8b8bae6b1d45aacd1b5f481d6b89281.png">和<img src="https://zk.995w.com/lqwvjeImg/3a/3a766027ffc74b8c2e0c860b7aab9a12.png">,它们的夹角是<img src="https://zk.995w.com/lqwvjeImg/42/426459ad748e4007fb960434086eeb7f.png">,则这两个向量的和向量的模为<img src="https://zk.995w.com/lqwvjeImg/e1/e1d3fd5b5ab593b64a78d967839928a8.png">.( )<br>·正确<br>·错误