Contact us
Choose a category below so we can get back to you as quickly as possible.
1/1*2=1/1-1/2 1/2*3=1/2-1/3 1/3*4=1/3-1/4 每組相加,將1/2,1/3,1/4,……抵消最後只剩1-1/100=99/100
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.