x+y+z=15 2x+3y+4z=47 3x+4y+5z=62
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x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y=3x+2z=4y+z 求x:y:z
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求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)
x+2y+3z=10,4x+3y+2z=15则x+y+z=
x+2y+3Z=10,4x+3y+2z=15,求x+y+z=
2x+y+3z=10,3x+4y+2z=15,则x+y+z=
2x+3y-z=9,x+y+z=15,5x-4y-z=0
2x+z=10 x+y-z=4 3x-y-z=0
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
3x-y+z=4,2z+3y-z=12,x+y+z=6的解
4x-9z=17 3x+y+15z=18 x+2y+3z=24x-9z=17 3x+y+15z=18 x+2y+3z=2方程组
x/2=y/3=z/4,则x+2y-z/z=?
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
4X-9Z=17 3X+Y+15Z=18 X+2Y+3Z=2