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 Diophantine inequality with four squares and one $k$th power of primes J. Korean Math. Soc.Published online April 4, 2019 Li Zhu School of Mathematical Sciences, Tongji University Abstract : Let $k$ be an integer with $k\geq 3$ and $\varepsilon>0$. Define $h(k)=\left[{\frac{k+1}{2}}\right],\,\,\sigma(k)=\min\left(2^{h(k)-1},\,{\frac{1}{2}}h(k)(h(k)+1)\right)$. Suppose that $\lambda_1,\cdots,\lambda_5$ are non-zero real numbers, not all of the same sign, satisfying that $\frac{\lambda_1}{\lambda_2}$ is irrational. Then for any real number $\eta$, the inequality \begin{eqnarray*} |\lambda_1p^2_1+\lambda_2p_2^2+\lambda_3p_3^2+\lambda_4p_4^2+\lambda_5p_5^k+\eta|<(\max p_j)^{-\frac{3}{20\sigma(k)}+\varepsilon } \end{eqnarray*} has infinitely many solutions in prime variables $p_1,\cdots,p_5$. This gives an improvement of the recent result. Keywords : prime, Davenport-Heilbronn method, sieve theory. MSC numbers : 11P32, 11P55. Full-Text :