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(1);X-2Y-Z=7(2)求X-Y-Z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 1.已知x,y,z满足2│x-y│+(根号2y-z)+z平方-z+(1/4)=0,求x,y,z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 已知实数xyz满足x/y+z+y/z+x+z/x+y=1求x^2/y+z+y^2/z+x+z^2/x+y的值 已知x.y.z满足方程组x+2y-4z=0 2x+y-5z=0 求x:y:z的值 已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值 已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值