{an}{bn}都是等差数列,已知An/Bn(各自前n项和)=(5n+3)/(2n-1)
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{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=?
![{an}{bn}都是等差数列,已知An/Bn(各自前n项和)=(5n+3)/(2n-1)](/uploads/image/z/16790130-18-0.jpg?t=%7Ban%7D%7Bbn%7D%E9%83%BD%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%B7%B2%E7%9F%A5An%2FBn%EF%BC%88%E5%90%84%E8%87%AA%E5%89%8Dn%E9%A1%B9%E5%92%8C%EF%BC%89%3D%285n%2B3%29%2F%282n-1%29)
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)
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