Contact us
Choose a category below so we can get back to you as quickly as possible.
S=15+15^2+15^3+.+15^100 15S=15^2+15^3+15^4+…+15^101 下式-上式得: 14S=15^101-15 故原式=S=(15^101-15)/14
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.