若x+y+4z=10,4x+4y+z=15,则x+y+z的值是

若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 2x+z=10 x+y-z=4 3x-y-z=0 若X+6Y+4Z=10 4X+4Y+Z=15求X+Y+Z 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里 4x+y+z=-3 2x+3y-4z=-10 x+2y-z=-1 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? 3x+2y+z=4 x+y+z=10 2x+3y-z=1 2x+3y+z=8 4x-y-z=10 x+2y-z=1 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. (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值 x-z=-4 z-2y=-1 x+y-z=-1 怎么解 x-y-z=0 4x+8y+z=17 z=1 x+y/2=z+x/3=y+z/4 x+y+z=27 x-4y+z=-302x+y-z=18x--y-z=7 14x+4y+z=200,x+y+z=100求解x,y,z x+2y=3x+2z=4y+z 求x:y:z