Ifn and y are positive integers and ~$450y=n^{3}$~, whichof the following must be an integer?
I. ~$\frac{y}{3\ast 2^{2}\ast 5}$~
II. ~$\frac{y}{3^{2}\ast 2\ast 5}$~
III. ~$\frac{y}{3\ast 2\ast5 ^{2}}$~
None
Ionly
IIonly
IIIonly
I,II, and III
450=2* 3^2 * 5^2
由于n^3是整数 所以 y=2^2 *3 *5 * (k^3)
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