Contact us
Choose a category below so we can get back to you as quickly as possible.
有雙曲線的定義有BF2-BF1=2a,所以BF2=BF1+2a,又AF1,AB,BF2成等差數列,所以2AB=AF1+BF2=AF1+BF1+2a,而AF1+BF1=AB,所以2AB=AB+2a,所以AB=2a 就這樣了,主要是結合定義做.
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.