设等差数列an的前n项和为Sn.公比是正数的等比数列bn的前n项和为Tn.a1=1.B1=3.a3+b3=17.T3-S3=12.求an 和b设等差数列{an}的前n项和为Sn.公比是正数的等比数列{bn}的前n项和为Tn.a1=1.B1=3.a3+b3=17.T3-S3=1
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