Contact us
Choose a category below so we can get back to you as quickly as possible.
已知函數f(x)=x^2+4x+3不等式f(x)>a對任意x屬於R成立 x^2+4x+3-a>0 所以Δ=16-4(3-a)
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.