若Y/X=3/2,Y/Z=3/4.则2XY+YZ/2YZ-XY=多少
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若x+y+z=3y=2z,则x/x+y+z=?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
若x/2=y/3=z/4,则3x-2y+5z/x+y+z=
若x/3=y/2=z/5,则2x-3y-z/x-y+z=
若2x=3y=5z,则3x-2y+z/x+y-z
若方程组2x+3y-z=0,x-3y-z=0,则x:y:z=?
若x:y:z=3:2:1,则x+2y-z/2x-y+z=
若方程组:x+y-2z=0,3x+y-z=0,则x:y:z=
若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?
若{x+3y+10z=0 则 (x+y-z)/(x-y+z){2x-y-2z=0
若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值
若x/2=y/3=z/4,则x+y+z/x=多少?
若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
若x/2=y/3=z/4则3x-2y+5z/x+y+x=
x/2=y/3=z/5 x+3y-z/x-3y+z