if y and n are positive integers, 450y=n^3, which of the following must be true
1. y/(3*2^2*5)
2. y/(3^2*2*5)
3. y/(3*2*5^2)
选1.
450y=2*3^2*5^2*y=N^3
所以Y的因子必然含有2个2, 一个3,一个5
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