Contact us
Choose a category below so we can get back to you as quickly as possible.
1.2.3.4
n加一和n减一
與N(N是不為0的自然數)相鄰的兩個自然數分別是(N-1)和(N+1)這三個數的和是(3N)
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.