设xyz=1,求xxy+x+1+yyz+y+1+zzx+z+1
设xyz=1,求xxy+x+1+yyz+y+1+zzx+z+1
x+y+z=1 求xyz/(x+y)(y+z)(z+x)的最大值
设函数z=z(x,y)由方程x^2+y^3-xyz^1=0确定,求z/x,z/y
已知xyz满足x+y+z=30,3x+y-z=50,设t=5x+4y+2z 1当t=40时,求xyz的值 2若xyz均为
x,y,z是素数,x^y+1=z,求xyz=?
己知x,y,z都是非零有理数,且满足|x|/x+|y|/y+z/|z|=1,请你求xyz/|xyz|的值.求因为所以?
设xyz=1,求x/(xy+x+1)+y/(yz+y+1)+z/(zx+z+1)的值
设x+y+z=3.求代数式[3[xyz-xy-xz-yz]+6]/[[x-1]^3+[y-1]^3+[z-1]^3]的值
已知实数xyz满足x+y+2z=1,设t=(x平方)+(y平方)+(z平方).求T的最小值
设z=z(x,y)由方程xyz+x+y+z+(x+y+z)^1/2=3^1/2所确定的隐函数,求x、y的偏导数
设x,y,z是三个互不相等的数,且z+1/y=y+1/z=z+1/x,则xyz=?
若x+y+z=0且xyz不等于0,求x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)的值