1以知:X-Y+Z=0,2X-3Y-4Z=0,且XYZ不等于0,(X2+Y2+Z2)/(X2+Y2-2Z2)的值.X2代表X的平方 Y2也是2Z2代表2乘Z的平方2 以知:abc=1,求(a/1+a+ab) + ( b/1+b+bc) + ( c/1+c+ca)的值.3当X=_时,分式(4X)/(2X-1)的值比分式(X+1
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以知方程组 4X—3Y—3Z=0 X—3Y—Z=0 求X:Z 和X:Y:Z
以知1/x=3/y=5/z,求4x^2+2yz+z^2/x+y-z*x-z-y/8x^2+4yz+2z^2的值.
3X+Y+Z=0,2X-Y+3Z=1,X+2Y-Z=4
2x+z=10 x+y-z=4 3x-y-z=0
若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值
1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38
x+2y-z=-5 x+y+2z=-1 3x+4y-2z=-12x+2y-z=3 2x+y+3z=0 4x+z=-4
以知4x-3y-2z=0和x--3y+z=0的解一样且z不等于0,求x除以z和y除以z的值
已知4x-3y-3z=x-3y+z=0(x、y、z不等于0)(1)求x:y:z (2)求2x+3y-4z/z的值
{x+y+z=4 {2y+z=0 {3x+2y-4z=-1解方程
2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值
以知方程组{⑴4x-2y-6z=0⑵x-5y-7z=0.求7x+2y+6z/3x+5y+7z的值.
x+2y-z=0 2x-3z=1 3x-y+2z=4x+2y-z=02x-3z=13x-y+2z=4
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
已知4x-3y-3z=0,x-3y-z=0求(1)x:z的值.(2)x:y:z的值.
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
{2x+y=10 {x-y+z=4 {3x-y-z=0