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填空题
If t is a positive integer, and 18t is the cube of an integer, then what is the least possible value of t ?____

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解析：
因为13＝1, 23 ＝8, 33＝27, 43 ＝64, 53＝125这几项等不能被18整除，而第六项63＝216能被18整除因为216= 18×12，所以t＝12。
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