Contact us
Choose a category below so we can get back to you as quickly as possible.
等差數列通項公式an=a1+(n-1)d 我沒太懂你的意思,是這樣嗎 設k+m+n=x+y+z ak+am+an=a1+(k-1)d+a1+(m-1)d+a1+(n-1)d=3a1+(k+m+n-3)d ax+ay+az=a1+(x-1)d+a1+(y-1)d+a1+(z-1)d=3a1+(x+y+z-3)d 所以ak+am+an=ax+ay+az
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.