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均为非负数,求t的取值范围

已知xyz满足|3x-2y+z|+|2x+y+2z|=0（xyz不等于o）求x+y除以z 已知三个正整数x,y,z满足x+y+z=xyz,且x 已知实数xyz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,z满足xyz=1,求证x^3/(x+y)+y^3/(y+z)+z^3/(z+x)大于等于3 正数XYZ满足(X+Y)(X+Z)=2则XYZ(X+Y+Z)最大值 已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz 已知xyz满足2/x=3/(y-z)=5/(y+z),则 (5x-y)/(y+2z)的值为? 已知有理数x.y.z满足（x-z-2)^2+(3x-6y-7)^2=/3y+3z-4/=0求xyz=多少 已知xyz=0且满足4x-3y-3z=0和x-3y+z=0,求x：y：z 已知有理数x,y,z满足条件：|x-z-2|+|3x-6y-7|+（3y+3z-4）^2=0,则xyz=? 已知x,y,z同时满足2x-3y=8,3y+2z=0,x-z=-2,试求xyz的值 已知x,y,z满足丨x-z-2丨+丨3x-3y-3丨=-(3y+2z-13)²;,求xyz的值 已知xyz满足x-2y+3z=0,2x-3y+4z=0,求x:y:z 已知xyz满足x-2y+3z=0,2x-3y+4z=0,求x:y:z 数学已知xyz满足x-2y+3z=0,2x+3y+4z=0,求x:y:z 已知xyz满足2x-3y-z=0,x+3y-14z=0.求x：y：z的值 已知有理数x,y,z满足(x-z-2)^2+(3x-6y-7)^2+|3y+3z-4|=0求xyz的值 已知,x,y,z同时满足2x+3y=8,9y+2z=0,x-z=-2,求xyz的值