等差数列的公差d≠0,a1是a2,a5的等比中项,已知数列a2,a4,,,…

等差数列的公差d≠0a1a2a5的等比中项,已知数列a2a4,……,,……为等比数列,数列的前n项和记为Tn,则2Tn9=_______

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