mæ件å¦ä¸ï¼%%%%%%%%%%%%%%%%%%%%%%%%%%%%function xdot=xiaxing2(t,x)c2=5e-11;r4=2.25e+10;m1=0.067;c7=0.22e-13;m2=0.068;c12=4e-12;r20=2.781e+10;c18=2.5e-10;xdot=[1.97e-3-x(1)/(r4*c2)+x(2)/(r4*m1*c7)+x(3)/(r4*c12*m1*m2) x(1)/(r4*c2*m1)-x(2)/(r4*c7*m1^2)-x(3)/(r4*c12*m2*m1^2) x(1)/(r4*c2*m1*m2)-x(2)/(r4*c7*m2*m1^2)-x(3)*(1/(r4*m1^2*m2^2)+1/r20)/c12+x(4)/(r20*c18) x(3)/(r20*c12)-x(4)/(r20*c18)];%%%%%%%%%%%%%%%%%%%%%%%%%%%%%ç¨ode45å½ä»¤è°ç¨ï¼ä»¿çæ¶é´ï¼0ï½100ï¼åå§å¼ä¸ºï¼ï¼»0ï¼0ï¼0ï¼0ï¼½ï¼è¿ä¸ªè¿ä¸æ¯å¾å¤æï¼è®¡ç®æºç®äºè¿ä¸ä¸ªå°æ¶æåºç°ç»æã请é®è¿æ¯æä¹åäºï¼
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