Contact us
Choose a category below so we can get back to you as quickly as possible.
展開式的通項為C(i,9)*a^(9-i)*(2y)^i,所以係數就是C(i,9)*2^i,因n=9,顯然係數最大的項應該是第5、6兩項,即i=4或5的時候,此時有 C(i,9)*2^i=C(4,9)*2^i=9!/[4!*(9-4)!]*2^4=2016 注:C(i,9)表示9個數中取i個的組合數
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.