x:y=2:3 y:z=4:5 4x-2y+3z=53
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x:y=2:3y:z=4:54x-2y+3z=53x:y=2:3y:z=4:54x-2y+3z=53x:y=2:3y:z=4:54x-2y+3z=53x:y=2:3,2y=3xy:z=4:5,4z=5
x:y=2:3 y:z=4:5 4x-2y+3z=53
x:y=2:3 y:z=4:5 4x-2y+3z=53
x:y=2:3 y:z=4:5 4x-2y+3z=53
x:y=2:3 ,2y=3x
y:z=4:5,4z=5y,12z=15y,
4x-2y+3z=53,16x-8y+12z=212,16x+7y=212,32x+14y=424,32x+21x=424,53x=424.x=8,y=12,z=15
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
x+y=5 2x+3y-z=9 x-y+z=4
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
x:y=3:2 y:z=5:4 x+y+z=66
x:y=3:2 y:z=5:4 x+y+z=66
{x:y=2:3 y:z=4:5 x+y+z=35
x:y=2:3 y:z=4:5 x+y+z=35
x+y+z=111,y:x=3:2,y:z=5:4
3x=4y 2y=5z 试求x:y:z
已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
3x-2y+z=4 x+y-z=5 4x-4y+3z=27
x+y+z=4,x+2y-z=4,3x-y+4z=5
｛ 5x-3y+z=25x+2y-4z=3-5x+y-z=2
x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?