Contact us
Choose a category below so we can get back to you as quickly as possible.
分子按 1,2,3,4,…… 符號按 +,-,+,-1…… 分母按 2,3,10,15,26 即1^2+1 2^2-1 3^2+1 4^2-1 5^2+1 (6^2-1) 所以為-6/35
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.