{an}{bn}都是等差数列,已知An/Bn（各自前n项和）=(5n+3)/(2n-1)
{an}{bn}都是等差数列,已知An/Bn（各自前n项和）=(5n+3)/(2n-1)
则an/bn=?
则an/bn=?
赞 jerryjerry 幼苗
共回答了26个问题采纳率：96.2% 举报
An=n*a1+n(n-1)*d1/2
Bn=n*b1+n(n-1)*d2/2
An/Bn
=[2a1+(n-1)*d1]/[2a1+(n-1)*d1]
=(5n+3)/(2n-1)
a1=4
b1=0.5
d1=5
d2=2
an/bn
=[4+5(n-1)]/[0.5+2(n-1)]
=(5n-4)/(2n-0.5)
Bn=n*b1+n(n-1)*d2/2
An/Bn
=[2a1+(n-1)*d1]/[2a1+(n-1)*d1]
=(5n+3)/(2n-1)
a1=4
b1=0.5
d1=5
d2=2
an/bn
=[4+5(n-1)]/[0.5+2(n-1)]
=(5n-4)/(2n-0.5)
1年前
8
可能相似的问题
-
已知an为等差数列,bn=an+an+1 求证bn为等差数列
1年前3个回答
你能帮帮他们吗