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The main purpose of this paper is using the analytic method and the properties of the classical Gauss sums to study the computational problem of one kind fourth hybrid power mean of the quartic Gauss sums and Kloosterman sums, and give an exact computational formula for it.

In this paper, we use the mean value theorem of Dirichlet L-functions, the properties of Gauss sums and Dedekind sums to study the hybrid mean value problem involving Dedekind sums and the two-term exponential sums, and give an interesting identity and asymptotic formula for it.

In this paper, we use the estimate for trigonometric sums and the properties of the congruence equations to study the computational problem of one kind sixth power mean of the three-term exponential sums. As a conclusion, we give an exact computational formula for it.

For any positive integer $k\ge 3$, it is easy to prove that the $k$-polygonal numbers are $a_n\left(k\right)=(2n+n(n-1)(k-2))/2$. The main purpose of this paper is, using the properties of Gauss sums and Dedekind sums, the mean square value theorem of Dirichlet $L$-functions and the analytic methods, to study the computational problem of one kind mean value of Dedekind sums $S(a_n\left(k\right){\overline{a}}_m\left(k\right),p)$ for $k$-polygonal numbers with $1\le m,n\le p-1$, and give an interesting computational formula for it.