请大家帮帮我解几道五年级数学题,谢谢!&1.83+88+93+···+208=?高斯算法:(首项+末项)*项数/2,但是,项数怎么算,帮帮我吧.&2.在4位数中,能被3.5.7整除的数一共有( )个.&3.一群小朋友玩积木,有
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![请大家帮帮我解几道五年级数学题,谢谢!&1.83+88+93+···+208=?高斯算法:(首项+末项)*项数/2,但是,项数怎么算,帮帮我吧.&2.在4位数中,能被3.5.7整除的数一共有( )个.&3.一群小朋友玩积木,有](/uploads/image/z/1690828-52-8.jpg?t=%E8%AF%B7%E5%A4%A7%E5%AE%B6%E5%B8%AE%E5%B8%AE%E6%88%91%E8%A7%A3%E5%87%A0%E9%81%93%E4%BA%94%E5%B9%B4%E7%BA%A7%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E8%B0%A2%E8%B0%A2%21%261.83%2B88%2B93%2B%C2%B7%C2%B7%C2%B7%2B208%3D%3F%E9%AB%98%E6%96%AF%E7%AE%97%E6%B3%95%EF%BC%9A%EF%BC%88%E9%A6%96%E9%A1%B9%2B%E6%9C%AB%E9%A1%B9%EF%BC%89%2A%E9%A1%B9%E6%95%B0%2F2%2C%E4%BD%86%E6%98%AF%2C%E9%A1%B9%E6%95%B0%E6%80%8E%E4%B9%88%E7%AE%97%2C%E5%B8%AE%E5%B8%AE%E6%88%91%E5%90%A7.%262.%E5%9C%A84%E4%BD%8D%E6%95%B0%E4%B8%AD%2C%E8%83%BD%E8%A2%AB3.5.7%E6%95%B4%E9%99%A4%E7%9A%84%E6%95%B0%E4%B8%80%E5%85%B1%E6%9C%89%EF%BC%88+++%EF%BC%89%E4%B8%AA.%263.%E4%B8%80%E7%BE%A4%E5%B0%8F%E6%9C%8B%E5%8F%8B%E7%8E%A9%E7%A7%AF%E6%9C%A8%2C%E6%9C%89)
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