已知x+2y-z=8,2x-y+z=18 ,求8X+Y-Z的值
已知x+2y-z=8,2x-y+z=18 ,求8X+Y-Z的值
已知X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值
已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值.要2种方法
已知:X、Y、Z满足2X-Y+4Z=8,X-2Y-Z=7,求X-Y+Z的值
已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值.
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
已知(z-x)∧2-4(x-y)(y-x)=0求x+z-2y+8的值
已知x,y,z满足方程组{x+y-z=6{y+z-x=2{z+x_y=0,求x,y,z的值