Contact us
Choose a category below so we can get back to you as quickly as possible.
等差數列的總和:(首項+末項)x公差除以2等差數列通項:第幾項=首項+(項數-1)x公差等比數列例題:原題:一個等比數列{an}中,a1+a4=133,a2+a3=70,求這個數列的通項公式.a1+a4=a1(1+q^3)=133,a2+a3=a1(q+q^2)=…
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.