已发，发的这些资料做模型够用了。一次性都发你了，好的话加分哦，希望帮到你，满意请采纳答案~
A.dw/dt=dw/dx*dx/dt+dw/dy*dy/dt+dw/dz*dz/dt =(1/y)(3e^(3t))+(-x/y^2+1/z)(2cos(2t))+(-y/z^2)(-3sin(3t)) =3e^(3t)/(2+sin(2t))+(-e^(3t)/(2+sin(2t))^2+1/(2+cos(3t)))(2cos(2t)) -[(2+sin(2t))/(2+cos(3t))^2](-3sin(3t))B plug in t=0dw/dt=3/2+1/6-0 =5/3
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