n阶非线性常微分方程 nth-order nonlinear differential equations ; 2 nth-order nonlinear differential equations ; n-order nonlinear differential equations

n阶常微分方程 n-th order ordinary differential equation ; nth order differential equation ; n-order ordinary differential equations ; nth order ordinary differential equations

非线性n阶常微分方程 nonlinear 4 nth-order differential equation

n阶线性微分方程 n step linear differential equation ; nth-order linear differential equation

n阶m次微分方程 n-order m-dehree homogeneous differential equations

n阶中立型微分方程 2n's order neutral equations

n阶非线性微分方程 nth-order nonlinear differential equation