z=f(x,y) x^3+2y^2+3z^2-4z=0确定的隐函数,求x的二阶偏导求详细步骤.谢谢
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![z=f(x,y) x^3+2y^2+3z^2-4z=0确定的隐函数,求x的二阶偏导求详细步骤.谢谢](/uploads/image/z/8535308-68-8.jpg?t=z%3Df%28x%2Cy%29+x%5E3%2B2y%5E2%2B3z%5E2-4z%3D0%E7%A1%AE%E5%AE%9A%E7%9A%84%E9%9A%90%E5%87%BD%E6%95%B0%2C%E6%B1%82x%E7%9A%84%E4%BA%8C%E9%98%B6%E5%81%8F%E5%AF%BC%E6%B1%82%E8%AF%A6%E7%BB%86%E6%AD%A5%E9%AA%A4.%E8%B0%A2%E8%B0%A2)
z=f(x,y) x^3+2y^2+3z^2-4z=0确定的隐函数,求x的二阶偏导求详细步骤.谢谢
z=f(x,y) x^3+2y^2+3z^2-4z=0确定的隐函数,求x的二阶偏导
求详细步骤.谢谢
z=f(x,y) x^3+2y^2+3z^2-4z=0确定的隐函数,求x的二阶偏导求详细步骤.谢谢
两边同时对x求一阶偏导得 3x^2+6z*z'-4z'=0(可以解出z’,用z和x表示)
再求二阶偏导得6x+6z‘*z’+6z*z''-4z''=0解出z''
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
一道函数不等式题求出所有这样的函数f:R-R,使得对于一切x,y,z∈R,有f(x+y)+f(y+z)+f(x+z)=3f(x+2y+3z)f(x+y)+f(y+z)+f(x+z)=3f(x+2y+3z)改为f(x+y)+f(y+z)+f(x+z)≥3f(x+2y+3z)
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
x/2=y/3=z/5 x+3y-z/x-3y+z
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
分解因式:f(x,y,z)=x^2(y-z)+y^2(z-x)+z^2(x-y)
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
x+y+z=6 x+2y+3z=14 y+1=z
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
X=3z X+y+z=12 X+2y-2z=10
2x+z=10 x+y-z=4 3x-y-z=0
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,