Given 3 ^ m = 2, 3N ^ = 4, find the value of 9 ^ m + 1-2n
I don't understand the title. Can you repeat it in Chinese?
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- 18. 1/(1*4)+1/(4*7)+1/(7*10)+…… +1 / [(3n-2) (3N + 1)] summation
- 19. Sn/Tn=3n+1/2n-1 RT please as soon as possible! Thank you~ If the sum of their first n terms is Sn / TN = 3N + 1 / 2N-1, then the ratio of the fifth term of these two sequences is? I forgot to enter the title when I was excited~
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