Contact us
Choose a category below so we can get back to you as quickly as possible.
∵在△ABC中,已知AB•AC=-2,|AB|•|AC|=4,可得4×cosA=-2,解得cosA=-12,∴A=2π3.故△ABC的面積為12×|AB|•|AC|×sinA=12×4×32=3,故答案為3.
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.