若x+2y-9z=0,x-2y-5z=0(xyz=0)求x^2-4y^2+9z^2分之2x^2+3y^2+7z^2的值
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
若x+2y-9z=0,x-2y-5z=0(xyz=0)求x^2-4y^2+9z^2分之2x^2+3y^2+7z^2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
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
已知xyz满足x-2y+z=0 7x+4y-5z=0,求y+z分之x的值
已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值.
已知方程组{2X-Y+3Z=0,X-3Y+Z=0(XYZ≠0),求3Y分之4X+2Z的值
已知XYZ满足方程组 X+Y-Z=6 Y+Z-X=2 Z+X-y=0 求X Y Z的值
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
若xyz不等于0 方程一:4乘以z分之x减去5乘以z分之y=负2 方程二:z分之x减去4乘以z分之y=3 求x:y:z