x-2y+4z=0 （1）4x-3y+z=0 （2）由(2)-(1)*4 5Y -1 5Z = 0 即 Y = 3Z (3)由(1)得 X = 2Y - 4Z 代入(3)式 得 X = 2Z2x²+y²+z²/x²+2y²+7z² = (8z² +9z²+z²)/(4z²+1...
已知:x-2y+4z=0,4x-3y+z=0,求2x²+y²+z²/x²+2y²+7z²
2个回答
相关问题
-
2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值
-
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
-
已知3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z)
-
已知x+2y-4z=0,3x-y-z=0,则3x+2y+z/x+2y+z=
-
已知2X-Y+Z=0.X+3Y-4Z=0,求x :y :z
-
已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z=
-
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
-
已知方程组4x-3y-6z=0,x+2y-7z=0(z≠0）,求x+y+3z/4x-y-5z的值
-
已知3x-4y-z=0.2x+y-z=0,且xyz=0,求x+2y-3z/3x-2y+3z
-
已知X/2=Y/3=Z/4≠0,求2x+3y-z/x+2y-3z