设<img src="/lqwvjeImg/cd/cd81e2defe6b7a799e61d78352a8c40a.png">为群,其中<img src="/lqwvjeImg/ce/ce7af784ebf4ab272c80abd3a2f6f452.png">是实数集,而乘法<img src="/lqwvjeImg/26/26cc490fd30044ea6d9041567f805c7d.png">,这里<img src="/lqwvjeImg/9a/9adc091b86ae5f5ae637fb46cdb2cf62.png">为<img src="/lqwvjeImg/ce/ce7af784ebf4ab272c80abd3a2f6f452.png">中固定的常数。那么群<img src="/lqwvjeImg/cd/cd81e2defe6b7a799e61d78352a8c40a.png">中的单位元<img src="/lqwvjeImg/77/772765e3183a208b5e5afe70c83016f1.png">和元<img src="/lqwvjeImg/7c/7c08d9215d5b083abdbbf6ceeb113ee6.png">的逆元分别是( )<br>·0和<img src="/lqwvjeImg/02/0297a19420f8ee0d3a99e5e5f0051554.png">;<br>·1和0;<br>·<img src="/lqwvjeImg/9a/9adc091b86ae5f5ae637fb46cdb2cf62.png">和<img src="/lqwvjeImg/4e/4e15c722c84b810fbc9a7236a7fa8183.png">;<br>·<img src="/lqwvjeImg/e1/e1dfa4e97081500df2e3072528e15fde.png">和<img src="/lqwvjeImg/7b/7bac3c078c12af510841aaa1f751c539.png">。