设函数y=y(x)由方程e^y xy e^x=0确定,求y(0)
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xy+e^y=y+1(1)求d^2y/dx^2在x=0处的值:(1)两边分别对x求导:y+xy'+e^yy'=y'y/y'+x+e^y=1(2)(2)两边对x再求导一次:(y'y'-yy'')/y'^
如图所示,最后求解是自上而下带入的
lny+x/y=0等式两边求导:y'*1/y+1/y+x*y'(-1/y²)=0(1/y-x/y²)y'=-1/y∴y'=(-1/y)/(1/y-x/y²)=-y/(y-
e^y+xy=e两边求导e^y*y'+y+xy'=0∴y'(e^y+x)=-yy'=-y/(e^y+x)即dy/dx=-y/(e^y+x)当x=0时,e^y=e,y=1∴dy/dx|(x=0)=-1/
两边对x求导:y'e^y+(1+y')cos(x+y)=0,1)这里可得到y'=-cos(x+y)/[e^y+cos(x+y)]再对1)求导:y"e^y+(y')^2e^y+y"cos(x+y)-(1
e^z-xyz=0z=㏑x+㏑y+㏑z[偏z偏x]=1/x+(1/z)[偏z偏x](这里y看成常数)[偏z偏x]=(1/x)/{1-(1/z)}=z/[x(z-1)]
网上有很多高数课后习题答案,你可以下载一个参考~e^y-e^x=xy两边求导,得e^y*y'-e^x=y+xy'(e^y-x)y'=(e^x+y)所以y'=(e^x+y)/(e^y-x)x=0时,原式
分别对y求导,求左边为1+【e^(x+y)×(dx/dy+1)】右边为2×dx/dy推的dx/dy:自己算下,没得草稿纸.
两端对x求导数(把y看作x的函数),则1-y'=e^(xy)*(1*y+x*y')y'[xe^(xy)+1]=1-ye^(xy)dy/dx=y'=[1-ye^(xy)]/[xe^(xy)+1]
dz=-dx-dy
xy+e^y=1e^y(0)=1y(0)=0xy'+y+e^yy'=00+y(0)+y'(0)=0y'(0)=0xy''+y'+y'+e^yy''+(y')^2e^y=00+2y'(0)+y''(0)
两端对x求导得e^x+e^y*y'=y+xy'y'=(e^x-y)/(x-e^y)dy=(e^x-y)/(x-e^y)dx
e^y-e^x=xy两边求导,得e^y*y'-e^x=y+xy'(e^y-x)y'=(e^x+y)所以y'=(e^x+y)/(e^y-x)x=0时,e^y-e^0=0,则e^y=1,则y=0所以y'(
y'=(x)'e^y+x(e^y)'y'=e^y+xe^y*y'再问:x(e^y)'=xe^y*y'?再答:对,因为y是x的函数,根据复合函数求导法,可得
两边对x求导数,得y'*e^y+y+xy'=0,在原方程中令x=0可得y=1,因此,将x=0,y=1代入上式可得y'+1=0,即y'(0)=-1.再问:对x求导时y可以当成一个常数吗?为什么要用公式(
/>e^y+xy+e^x=0两边同时对x求导得:e^y·y'+y+xy'+e^x=0得y'=-(y+e^x)/(x+e^y)y''=-[(y'+e^x)(x+e^y)-(y+e^x)(1+e^y·y'
min是指f(x)g(x)h(x)三个函数中的最小值
两边对x求导:1+y'=y'e^y得dy/dx=y'=1/(e^y-1)
化为:e^(ylnx)-e^y=sin(xy)两边对x求导:e^(ylnx)(y'lnx+y/x)-y'e^y=cos(xy)(y+xy')y'[lnxe^(ylnx)-e^y-xcos(xy)]=[