x+y-2z=0 11x+4y-8z=7 27x+104y-54z=77
(x+y-z)(x-y+z)=
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
解三元一次方程:x+y-z=0,2x+y+z=7,x-3y+z=8
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
方程组X:Y:Z=4:7:8,X+Y+2Z=54 求XYZ
解方程组:x:y:z=4:7:8,x+y+2z=54
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
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