Contact us
Choose a category below so we can get back to you as quickly as possible.
因為x<0,則-x>0 所以x+1/x=-[(-x)+(-1/x)] 因為[(-x)+(-1/x)]>=2倍根號下[(-x)(-1/x)〕 =2 所以[(-x)+(-1/x)]>=2 囙此-[(-x)+(-1/x)]<=-2
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.