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已知等差数列{an}的公差大于0,且a3,a5是方程x2-14x+45=0的两根,数列{b...
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已知等差数列{a
n}的公差大于0,且a
3,a
5是方程x
2-14x+45=0的两根,数列{b
n}的前n项的和为S
n,且
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WUlG7sYNOz/WZT34TrVoO9iygLTktKWONdb7fYC7MaH7+QCJhbHyg7wuxsKKbG0f4EqzRQTmRd/O
12OlhzzZWaM1mALcjcGi4Cb6GSyT7+lLc7MjV2suU5BubDn013+PcNeRK4BSWhz4GASFXltoCoqe
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9V5Zcn62/W5EYkcfNXJlAePSVcSi1B4RNGza4XQI68p+3xtSc/t156iWdUTLpV2ot0hSk+3vkXFu
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6HJvPk6OFXl6aHDdLdN7F9H2bXP+WRCtMJHdMVcDJLi3vWChI7IirnxTHopMoF4nOHBvYKYqNfXM
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PU4AAAAASUVORK5CYII=
)
.
(Ⅰ) 求数列{a
n},{b
n}的通项公式;
(Ⅱ) 记c
n=a
n•b
n,求证:c
n+1≤c
n;
(Ⅲ)求数列{c
n}的前n项和.
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