Contact us
Choose a category below so we can get back to you as quickly as possible.
OA=(1,1),OB=(2,3),則OP=(2x+1,3x+1),點P在第四象限,則2x+1>0且3x+1
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.