已知{3x-y+2z=14 4x-8y+z=7 求x+y+z的值
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z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.
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4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知2x=3y=4z求2x-y+z分之x+y+z的值
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值