a1=2 (1+2am)为公比2的等比数列 a6=?
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![a1=2 (1+2am)为公比2的等比数列 a6=?](/uploads/image/z/15253731-27-1.jpg?t=a1%3D2+%281%2B2am%29%E4%B8%BA%E5%85%AC%E6%AF%942%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97+a6%3D%3F)
a1=2 (1+2am)为公比2的等比数列 a6=?
a1=2 (1+2am)为公比2的等比数列 a6=?
a1=2 (1+2am)为公比2的等比数列 a6=?
a1=2 (1+2am)
a6=2 (1+2am)*2^(6-1)
a6=64 (1+2am)
令bm=1+2am
b1=1+2*2=5
q=2
bm=5*2^(m-1)
b6=5*32=160
b6=1+2a6
a6=159/2