Contact us
Choose a category below so we can get back to you as quickly as possible.
A B互為相反數 A+B=0 =>B=-A AB+B/A + AB+A/B =(AB-A)/A+(AB-B)/B =B-1+A-1 =(A+B)-2 =-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.