In the paper, we study the (3+1)-maintained positive Korteweg-devries-Zakharov-Kuznestsov (mKdvZKE) equations and (3+1)-dimensional Yu-Toda-Sassa-Fukuymama (YTSFE) equations, which have a wide background of application and important significance in nonlinear science and engineering. The (3+1)-dimensional mKdvZKE and (3+1)-dimensional YTSFE are firstly transformed into ordinary differential equations by applying the travelling wave transformation and the substitution transformation, and then the new exact solutions of the two equations are obtained by choosing the double (G/G',1/G) expansion method. As examples, the method is applied to solutions for kink, soliton wave, periodic function, trigonometric function, etc. The method enriches the solutions of (3+1)-dimensional modified Korteweg-devries- Zakharov- Kuznestsov (mKdvZKE) equations and (3+1)-dimensional Yu-Toda-Sassa-Fukuymama (YTSFE) equations, which demonstrates the scientificity and universality of the method in solving the new exact solutions of the nonlinear evolution equations.
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