2(x+3y)+(x+y+z)=5.8和3(x+3y)+(x+y+z)=6.3组成方程组,问x+y+z=多少?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
方程组{4x-3y-3z=0,x-3y+z=0,(x.y.z不等于0),求x/z和y/z的值?
已知方程组2x-3y-4z=0和x+y+z=0,并且z≠0,求x:y与y:z
已知方程组2x+y-5z=0和3x-3y-z=0.则x:y:z=多少:多少:多少 急
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
三元一次方程组x+y/3=x+z/2=y+z/2 x+y+z=28
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.