求下列方程所确定的隐函数y=y(x)的导数y’或微分dy.1,exy+ylnx=cos2x,求y’2,x2+y2+xy=0,求y’3,xy-ex+ey=1,求dy.我对数学真的不懂,越详细越好.1题e后面的xy是次方.

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/23 20:03:23
求下列方程所确定的隐函数y=y(x)的导数y’或微分dy.1,exy+ylnx=cos2x,求y’2,x2+y2+xy=0,求y’3,xy-ex+ey=1,求dy.我对数学真的不懂,越详细越好.1题e后面的xy是次方.
xRn@T[cbq(B\fn7MJI ԊV=И\qʻ[  Pmwfޛ7o֩n8C#|1|6hI{3qZ w]lT5 ?{a:XU#?xř6wL{7j~2 rBEbǤR{>$_c3#mT=tn^6ufe6?f׽g[`&YRV)%pY/&|~<Dt-p-d>? 堌y?xc|(1-.I#.*2mu%c!iϠXf>>ΥƟȦ dōiL.ܧ>Pw XȊZkɊ,mU[ i!:L7x6crbقlU>M

求下列方程所确定的隐函数y=y(x)的导数y’或微分dy.1,exy+ylnx=cos2x,求y’2,x2+y2+xy=0,求y’3,xy-ex+ey=1,求dy.我对数学真的不懂,越详细越好.1题e后面的xy是次方.
求下列方程所确定的隐函数y=y(x)的导数y’或微分dy.
1,exy+ylnx=cos2x,求y’
2,x2+y2+xy=0,求y’
3,xy-ex+ey=1,求dy.
我对数学真的不懂,越详细越好.1题e后面的xy是次方.

求下列方程所确定的隐函数y=y(x)的导数y’或微分dy.1,exy+ylnx=cos2x,求y’2,x2+y2+xy=0,求y’3,xy-ex+ey=1,求dy.我对数学真的不懂,越详细越好.1题e后面的xy是次方.
楼上的求错了!
1,令F(x,y) = e^(xy)+ylny-cos2x则可由隐函数存在定理求dy/dx = -F'x/F'y
F'x是F对x的偏导数(把y看成定量,然后对x求导),F'y类似
F'x = ye^(xy)+2sin2x,F'y = xe^(xy)+lny + 1
于是dy/dx = -[ye^(xy)+2sin2x]/[xe^(xy)+lny + 1]
2,F(x,y)=x^2+y^2+xy
F'x = 2x+y ,F'y = 2y+x => dy/dx = -(2x+y)/(2y+x)
3,F(x,y) = xy-e^x+e^y-1
=> dy = -(F'x/F'y)dx
=[-(y-e^x)/(x+e^y)]dx