x/3=y/6=z/8 3x+5y-6x=-18,解三元一次方程

x/3=y/6=z/8 3x+5y-6z=-18 求x,y,z 已知x:y=3:6,y:z=8:5求x:y:z 6x+5y+3z=100 x+y+z=30 求 x y 已知3X=4X,5Y=6Z求X+Y：Y+Z 三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=262x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4z=26 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程 6x-y-z=3 2x-4y+8z=5 3x-6y-z=10 y z 分别等于几?大虾 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 解方程组3x+y+z=6,x+3y+z=5,x+y+3z=9｛3x+y+z=6｛x+3y+z=5｛x+y+3z=9 解方程:x+2y+3z=8 x+3y+5z=6求x+y=? y+z-3x=3z+x-3y=5x+y-3z=6 解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8 解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8 X:Y=3:4,Y:Z=6:5=X:Y:Z=( ):( ):( ) 解方程组x-y+z=0,3y-z=8,x+y=6