x+y-2z=5 2x-y-z=4 3x+y-3z=10;分别求x、y、z的值.
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x+y-2z=52x-y-z=43x+y-3z=10;分别求x、y、z的值.x+y-2z=52x-y-z=43x+y-3z=10;分别求x、y、z的值.x+y-2z=52x-y-z=43x+y-3z=
x+y-2z=5 2x-y-z=4 3x+y-3z=10;分别求x、y、z的值.
x+y-2z=5 2x-y-z=4 3x+y-3z=10;分别求x、y、z的值.
x+y-2z=5 2x-y-z=4 3x+y-3z=10;分别求x、y、z的值.
x+y-2z=5 (1)
2x-y-z=4 (2)
3x+y-3z=10 (3)
(1)+(2)
3x-3z=9
x-z=3 (4)
(2)+(3)
5x-4z=14 (5)
(5)-(4)×4
5x-4x=14-12
所以
x=2
z=x-3=-1
y=5+2z-x=1
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x/2=y/3=z/5 x+3y-z/x-3y+z
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
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
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
x+y=5 2x+3y-z=9 x-y+z=4
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
2x+z=10 x+y-z=4 3x-y-z=0
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
{ 5x-3y+z=25x+2y-4z=3-5x+y-z=2
x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?
x+y+z=4 2x-y+z=3 3x-2y-3z=-5
3x-2y+z=4 x+y-z=5 4x-4y+3z=27