z=y/[(x^2+y^2)^(1/2)] 全微分
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z=y/[(x^2+y^2)^(1/2)]全微分z=y/[(x^2+y^2)^(1/2)]全微分z=y/[(x^2+y^2)^(1/2)]全微分∂z/∂x=(-xy)[(x^2
z=y/[(x^2+y^2)^(1/2)] 全微分
z=y/[(x^2+y^2)^(1/2)] 全微分
z=y/[(x^2+y^2)^(1/2)] 全微分
∂z/∂x=(-xy)[(x^2+y^2)^(-1/2-1)]=(-xy)[(x^2+y^2)^(-3/2)]
∂z/∂y=(x^2+y^2)^(-1/2)+(-y^2)[(x^2+y^2)^(-3/2)]=(x^2)[(x^2+y^2)^(-3/2)]
dz=(-xy)[(x^2+y^2)^(-3/2)]dx+(x^2)[(x^2+y^2)^(-3/2)]dy
1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z)
x+y+z=6 x+2y+3z=14 y+1=z
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
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X+2Y= -12X+Y+Z= 1-X+Y-Z= -1
求X Y Z各代表什么数,使下列等式成立1、X+X+X=Y+Y;2、Y+Y+Y+Y=Z+Z+Z;3、X+Z+Y+Y=180
X+y+z=26,x-y=1,2x-y+z=18
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值