例如:2X+Y=10 4Y+Z=21 X,Y,Z各为多少?5X-Z=10
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
(x+y-z)(x-y+z)=
若x、y、z、满足(9/8)^x ×(10/9)^y×(16/5)^z=2,则x、y、z、的值为多少
x,y,z为实数 且(y-z)^2+(x-y)^2+(z-x)^2=(y+z-2x)^2+(x+z-2y)^2+(x+y
x,y,z为实数且(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y-
若4x=7y+5z,2x+y=z,则x:y:z的值为
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
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-
1.x+y+z=30,3x+y-z=50,x,y,z为非负数,求5x+4y+2z取值范围.
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
x+2y+3z=10,x-y+4z=10,x+3y+2z=2