解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.
解方程组:2x+3y+4z=20,x+y+z=7
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
解三元一次方程组:{x+y+z=4 2x+y+3z=9 x+3y+2z=14 {3x+y-z=7 x+2y+2z=12
x+z=y 7*x=y+z+2 x+y+z=14 解这个方程组、
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组x+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19
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.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
解方程组7y-x=4,2x+y=3.x+2y+3z=14,2x+y+z=7,3x+y+2z=11.