输入dsolve('N2*Dv=p2*N1*(1-v)*(1/(1+999*exp(-1/5*t)))+p3*N2*(1-v)*v','v(0)=0','t')后,得到了ans=1-2*exp(-(p3*t*N2+5*p2*N1*log(1+999*exp(-1/5*t))-5*p2*N1*log(exp(-1/5*t)))/N2)/(2*exp(-5*p2*N1*log(1000)/N2)+2*Int(-p3*exp(-(p3*_z1*N2+5*p2*N1*log(1+999*exp(-1/5*_z1))-5*p2*N1*log(exp(-1/5*_z1)))/N2),_z1 = 0 .. t)),这个_z是什么意思?_z=0..t是什么意思?????
带着这个积分项,无法画图是吗?
追答是的