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\(z=x{e}^{-y/x} ,x*{d}^{2}z/dxdy+2(dz/dx+dz/dy)=y*{d}^{2}z/d{y}^{2}\) вот d- в уравнении обозначено как 6 только наоборот

Guest Apr 16, 2017
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 #1
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As follows:

 

.

Alan  Apr 16, 2017
 #2
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Спасибо большое вам!!!

Guest Apr 16, 2017

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