Contact us
Choose a category below so we can get back to you as quickly as possible.
C(9 r)x^(9/2-r/2)(-1)^rx^(-r)=C(9 r)x^(9/2-3r/2)(-1)^r 令9/2-3r/2=0,r=3 所以常數項為-C(9 3)=-84
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.