there are twenty-six l_____ in zhe english alphabet

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• there are twenty-six l_____ in zhe english alphabet
• there are twenty-six l_____ in zhe english alphabet
• 用There be 造句从没三个里面选一个造句一.seven twenty-six nine thirty fifteen fifty二.letters players days days planets sisters三.September the solar system the USA a weeka rugby team the English alphabet 1.There are seven days in a week.2______________________________________3._____________________________________4._____________________________________5._____________________________________6._____________________________________从每三个里面选一个造句 一.seven / twenty-six / nine
• 已知等差数列｛αn｝中a1=1 ,α6+α7=24,求该数列的通项αn和前n项和Sn
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