Contact us
Choose a category below so we can get back to you as quickly as possible.
原式=(1+1/2009)(2008+1/2009)=2008+1/2009+2008/2009+(1/2009)^2 =2009又(1/2009)^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.