Contact us
Choose a category below so we can get back to you as quickly as possible.
令f(x)=ax^2+bx-1,由於a>0,且f(0)= -11-3= -2, 也即a-b的取值範圍是(-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.