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5/18 5/9 16/9(x)40/9 即 5/18,10/18,52/18,y/18,80/18 考察5,10,52,y,80 5=5*(2^0).1個質數的積 10=5*(2^1).2個質數的積 52=13*(2^2).3個質數的積 y=… 80=5*(2^4).5個質數的積 按規律知道y是2^3的倍數,且y為4個質數的積,且52
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