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已知数列{an}是等差数列,a2=3,a5=6,数列{bn}的前n项和是Tn,且Tn+bn...
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已知数列{a
n}是等差数列,a
2=3,a
5=6,数列{b
n}的前n项和是T
n,且T
n+
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKVJREFU
OE/dU9ENhTAIxJVZh02YgylYAqGNlVptNO/FD0mapskB1+NYzANmEYBZwH2AsiGgsfYptYJQ8PBz
Bagoo48DikihQz0ku1gPpL4Yyh8qbMTO7mKm+374jWQzjAuFbNlUYKFiky5M46AkJahIl6GMXZXx
F9EuVziSF5oNq+NTU1MLNUZyb5/tRVmNcSdahWCeTRKLtL0hSI2D2lu9NqyJKVYckNqVrS3EAwAA
AABJRU5ErkJggg==
)
b
n=1.
(1)求数列{a
n}的通项公式与前n项的和M
n.(2)求数列{b
n}的通项公式.
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已知数列{an}是等差数列,a2=6,a5=18;数列{bn}的前n项和是Tn,且Tn+
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(2)求证:数列{bn}是等比数列;
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(2)求证:数列{bn}是等比数列;
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(2)求证:数列{bn}是等比数列;
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