设<img src="/lqwvjeImg/21/2166c6ae8721970ed3ed2ce1f9bde11c.png">和<img src="/lqwvjeImg/7c/7c08d9215d5b083abdbbf6ceeb113ee6.png">都是群<img src="/lqwvjeImg/ce/ce7af784ebf4ab272c80abd3a2f6f452.png">中的元素且<img src="/lqwvjeImg/72/72bdf8deedd0bc6f29335e8b0e31031f.png">,那么<img src="/lqwvjeImg/99/993de1dd2ba1a0113e84e38ed01db472.png">( )<br>·<img src="/lqwvjeImg/bb/bb911483c0e6ef570db4faefb25c950b.png">;<br>·<img src="/lqwvjeImg/eb/eb647ad3249ef28f199880c7ba80ef43.png">;<br>·<img src="/lqwvjeImg/2e/2e90e5d385ee4f7e8a4c5cd31164c1ef.png">;<br>·<img src="/lqwvjeImg/cf/cfb8874424b3564f417df3722bbb52c4.png">。