Suppose a polynomial function of deglee 5 with rational coefficients has the given numbers as zeros. Find the other zero(s). 1,2,1-4i, 5

Step 1 ：Suppose a polynomial function of degree 5 with rational coefficients has the given numbers as zeros: 1, 2, 1-4i, 5.

Step 2 ：A polynomial function of degree 5 has 5 zeros.

Step 3 ：If a complex number is a zero of a polynomial with real coefficients, then its conjugate is also a zero.

Step 4 ：So, the missing zero is the conjugate of the given complex zero, which is 1+4i.

Step 5 ：Final Answer: The missing zero is \(\boxed{1+4i}\).