X+Y=Z5X+5Z=803Y+5Z=70XYZ是等于几?
X+Y=Z5X+5Z=803Y+5Z=70XYZ是等于几?
已知x:y:z=3:5:7,求2x−3y+4z5x+3y−2z
若 x/2等于y/3等于z/4,且x+y-z=5 求xyz的值
已知三个质数x、y、z满是x+y+z+xyz=99那么|x-y|+|y-z|+|z-x|的值等于
设xyz不 等于0,且2x-y+z=0,x+2y-5z=0,试求代数式(x-y)/(y+z) 的值
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
若x=y/2=z/5,x+y+z=16,xyz=?
已知xyz=231,问x+y+z 等于多少
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
已知xy/5=y+z/6=z+x/7,且xyz不等于0,求x:y:z
3道高数题,1,函数F(x,y,z)=(e^x) * y * (z^2) ,其中z=z(x,y)是由x+y+z+xyz=
x+y+z=1 求xyz/(x+y)(y+z)(z+x)的最大值