给出了 Drygas 二次型函数方程的定义，并得到其一般解；讨论了 Drygas 二次型函数方程与混合三次-四次型函数方程的关系，并在 Banach 空间及模糊赋范空间上讨论了它的 Ulam 稳定性。%A class of Drygas-quadratic functional equation is defined,and its general solution is obtained. Meanwhile,the relationship between Drygas-quadratic functional equation and cubic-quartic functional equation is given.Finally the Ulam stability of Drygas-quadratic functional equation in Banach space and fuzzy normed space is discussed.
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