126.127,这两个题怎么做,
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126.127,这两个题怎么做,
126.127,这两个题怎么做,
126.127,这两个题怎么做,
126.两边对x求导,2x-2yy'=0,y'=x/y,y''=(y-xy')/y^2=(y-x^2/y)/y^2=(y^2-x^2)/y^3.
127.两边对x求导,y'=e^y+xy'e^y,y'=e^y/(1-xe^y),
y''=(y'e^y+e^y(e^y+xy'e^y)/(1-xe^y)^2=2e^(2y)/(1-xe^y)^3