f(x,-x)=x^2+2x,fx(x,-x)=5x+1,则fy(x,-x)=
1个回答
fx-fy=df(x,-x)/dx=2x+2
fy=fx-2x-2=3x-1
相关问题
f(x,-x)=x^2+2x ,fx(x,-x)=5x+1 求fy(x,-x)=多少
设Z=f(x,y)且f(x,x^2)=x^3+1,fx(x,x^2)=x^2-2x^3,则求fy(x,x^2)=?
概率论 设X~fx(X),Y=-2X+1,则fy(y)=
设函数f(x,y)具有连续偏导数,且f(x,2x2-3x+4)=x,fx(1,3)=2,则fy(1,3)=______.
设f(x,y)可微,且f(x,2x)=x,f对x的偏导fx(x,2x)=x平方,求f对y偏导fy(x,2x).
x定义域(0,无穷),且fxy=fx+fy,当x>1,fx>0,若f1/3=-1,满足不等式fx-f1/(x-2)>=2
若fx=1/3x^3-f(1)x^2+2x+5 则f(2)?
x≥y≥27由fx fy=f[x y/
已知函数fx对于x>0有意义且满足f2=1 fxy=fx+fy,fx是增函数,若fx+f(x-2)》=2成立则x取值范围
F(x+y)=fx+fy,且当x>0时,fx