> 数学 >
已知等差数列{an}的公差为d,求证:
aman
m−n
=d.
人气:431 ℃ 时间:2020-05-19 13:45:57
解答
∵等差数列{an}的公差为d,
aman
m−n
=
a1+(m−1)d−a1−(n−1)d
m−n
=
(m−n)d
m−n
=d.
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版