b1+b2+b3+……+bn=3/[3*5]+3/[5*7]+3/[7*9]+……+3/【[2N+1]*[2N+3]】
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b1+b2+b3+……+bn=3/[3*5]+3/[5*7]+3/[7*9]+……+3/【[2N+1]*[2N+3]】
求BN的前N项和TN
求BN的前N项和TN
![b1+b2+b3+……+bn=3/[3*5]+3/[5*7]+3/[7*9]+……+3/【[2N+1]*[2N+3]】](/uploads/image/z/1218259-19-9.jpg?t=b1%2Bb2%2Bb3%2B%E2%80%A6%E2%80%A6%2Bbn%3D3%2F%5B3%2A5%5D%2B3%2F%5B5%2A7%5D%2B3%2F%5B7%2A9%5D%2B%E2%80%A6%E2%80%A6%2B3%2F%E3%80%90%5B2N%2B1%5D%2A%5B2N%2B3%5D%E3%80%91)
![](http://img.wesiedu.com/upload/e/81/e8136128f82ddd1625de95da30af9c2d.jpg)
b1+b2+b3+……+bn=3/[3*5]+3/[5*7]+3/[7*9]+……+3/【[2N+1]*[2N+3]】
有两个等差数列{an],{bn]满足(a1+a2+a3+…an)/(b1+b2+b3+…bn)=(7n+2)/(n+3)
令bn=1/(n2+2n) Tn=b1+b2+b3+……+bn
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若两个等差数列{an} {bn} 满足a1+a2+a3+.+an/b1+b2+b3+.+bn=7n+2/n+3 求a5/
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