先化简,再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝先化简，再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝，其中－根号2007。小明同学做题时把X错抄成了x＝根号2007

先化简,再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝先化简，再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝，其中－根号2007。小明同学做题时把X错抄成了x＝根号2007
先化简,再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝
先化简，再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝，其中－根号2007。小明同学做题时把X错抄成了x＝根号2007。但他的答案也是正确的，请解释这是怎么回事

先化简,再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝先化简，再求值：｛[（X－3）÷（X＋3）]＋[（6X）÷（X²－9）]｝，其中－根号2007。小明同学做题时把X错抄成了x＝根号2007
first public training sessions together,Bo Zhang is undoubtedly the most popular of all the players in one.Experienced a "hand door" crisis,this teenager in training staff on August 1 in the state and was not affected,emergency stop shooting jumper than half,power leveling,assistant coach Guo Shiqiang sidelines could not help but applaud him.2010 World Basketball Championships Preview:Men's Basketball Team held its first public course in China [Sports Photo Center] Denghua De Zhang Bo and the beast beast pointing hand grabbed the back of the photo to the original and less concern drove overnight basketball players the cusp.Therefore,after the end of training,shy Zhang Bo was swarm of reporters surrounded,the conversation is started from an affair outside the golf course,wow power leveling,"I said on that matter is more pale,Deng guide has also helped me to explain .Now I have to do is forget all the past as soon as possible,to train hard,no matter can enter the list of 12 people will do in accordance with the requirements of coaching,with practical actions to return the trust of coach."beast and the beast" hand door \That group photo before the filming date has been confirmed in the end of April,not during basketball training camp,world of warcraft powerleveling,but "that thing" or words inadvertently reveals the parties Zhang Bo's some frustration.Fortunately,the players coach Deng Huade always stood side,there are clear facts,he convened the first time the media Zhangbo Cheng Qing,and for his performance in training quite sure.For the coach of the trust and support,Zhang Bo naturally extremely grateful for the interview he said he would return with concrete actions,"he chose me into the national team,so I got the opportunity to progress,power leveling,and now its out This thing has helped me out of the woods.To tell the truth,to face such a coach I am lucky and very grateful."
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因为根号2007的值与答案X的值相同、所以小明把X错抄成了x＝根号2007不影响最后的答案！

化简得：（x²+9）/（x²-9）
因为-根号2007与根号2007的平方相同
所以他的答案也正确