还不给分。还要详细过程。汗。。。1. n = 2 100=1+1+2n+1+3n+.....1+9n An = 2n-12. 是
1.S10=(A1+A10)×10/2=(A1+A1+9d)×5=100d=2An=2n-12.log2Bn=AnBn=2^An=2^(2n-1){Bn}是等比数列
