已知方程组4x+2y-2z=5,2x+3y-z=1,则22x+5y-11z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知x.y.z满足方程组x+2y-4z=0 2x+y-5z=0 求x:y:z的值
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解下列方程组(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)5x-4y+4z=13 2x+7y-3z
已知2x+5y+4z=15.7x+y+3z=14 则x+y+z=?
已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则(x+y+3z)÷(4x-y-5z)=?结果和思路!
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
解三元一次方程组:(1)x+2y+3z=11x-y+4z=10x+3y+2z=2(2)x:y=3:5y:z=5:6x+y
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3