求f(x,y)=sin(xy+x+y)的全微分?

求f(x,y)=sin(xy+x+y)的全微分? Xy-sin(x+y)=1 求Y的导数 sin(x*x+y)=xy 求y'x sin(xy)=x+y,求dy f（x,y）=sin（xy）,求fx（x,y）=? sin(xy)+ln(y-x)=x,求y` sin(xy)+ln(y-x)=x,求y 设Z=sin(x+y)e的f（xy)次方,求əz/əx,əz/əy f(x,y,z)=sin(xy)cos(yz)的二阶偏导数怎么求 f(x,y,z)=sin(xy)cos(yz)的二阶偏导数怎么求 设u=f( lnxy ,sin(xy) ),求x和y关于u的偏导数 f(x,y)=xy+e^x x arctanx/y ,求f(x+y,x-y) sin(xy)=x 求dx/dysec(xy)-y ]/x 还是 x/[sec(xy)-y] 设函数y=f（x）由方程sin（xy）=x+y确定,求y’和dy. f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)! f(x+y,x-y)=2xy(x-y),求f(x,y) f(xy,x-y)=x^2-xy+y^2.求f(x,y) Sin(xy)=x+e^y求y'=