mathematica 作图,R = 0.008;r = 0.0125;Y = 47*2*3.14;z = 0.09;m = 0.08;k = 9;g = 10;f = 0.00018;e = 30;NDSolve[{0.5*m*R^4 *(y[t])^2 *(y'[t])^2/(R^2*Y^2 + z^2 - R^2*y[t])^2 + 0.2*m*r^2*(y'[t])^2 + 0.5*k*(R^2*Y^2 + z^2 - R^2*y[t]^2) + 0.5*k*z^2 - k*z*

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