Contact us
Choose a category below so we can get back to you as quickly as possible.
根據a+b=2,ab=-3,∴(a-b)2=(a+b)2-4ab,=4+12=16,故a-b=±4.故選D.
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.