若z=ylnx,则dz等于(  )A.ylnxlnyx+ylnxlnyyB.ylnxlnyxC.ylnxlnydx+ylnxlnyxdyD.ylnxlnyxdx+ylnx

若z=ylnx,则dz等于(  )A.ylnxlnyx+ylnxlnyyB.ylnxlnyxC.ylnxlnydx+ylnxlnyxdyD.ylnxlnyxdx+ylnxlnxydy

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若z=ylnx,则dz等于( )A.ylnxlnyx+ylnxlnyyB.ylnxlnyxC.ylnxlnydx+y...
由z=ylnx,得zx=ylnx?1x=ylnxx,zy=lnx?ylnx?1=ylnxlnxy∴dz=ylnxxdx+ylnxlnxydy故选:D

求隐函数导数ln(xy)=e^x+y所确定的隐函数y=y(x)的导数dy\/dx. 请答...
ln(xy)=e^x+y lnx+lny=e^x+y 两边同时对x求导 1\/x+(1\/y)(dy\/dx)=e^x+dy\/dx dy\/dx=[(1\/x)-e^x]\/[1-(1\/y)]=(y-xye^x)\/(xy-x)

大一微积分求帮助,在线等,急
az\/ax=y*x^(y-1)az\/ay=x^ylnx 1\/y*y'=4x³两边积分,得 lny=x^4+lnc y=ce^(x^4)x=0,y=4代入,得 4=c 所以特解为y=4e^(x^4)au\/ax=y\/(1+x²y²),au\/ay=x\/(1+x²y²)du=y\/(1+x²y²)dx+x\/(1+x²y²)dy...

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