x:y=2:3,y:z=4:5则3x+y-z=42,x=_.y=_z=_
x:y=2:3,y:z=4:5则3x+y-z=42,x=_.y=_z=_
已知x、y、z是三个非负整数,满足3x+2y+z=5,x+y-z=2,若s=2x+y-z,则s的最大值与最小值的和为 _
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x/2=y/3=z/5 x+3y-z/x-3y+z
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知2x+5y+4z=15.7x+y+3z=14 则x+y+z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
(x+y-z)(x-y+z)=
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-