x+y+z=10 和9x+2y+5z=61怎样解方程最好把过程写全了,

三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31 解方程组：{x(x+y+z)=6 {y(x+y+z)=9 {z(x+y+z)=10 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 方程组3x+y+2z=10,2x+3y-z=9,x+y+z=6 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 接下列方程组 1.x+y=7,y+z=8,x+z=9,2.5x+y+z=6,x+5y+z=-2,x+y+5z=10 9x-5y+z=-6 9x+y-2z=3 -9x+3y-5z=0 求x y z 方程组{x/2+y/3-z=-5,x/3-y/2+z/2=10,x/2-y/3-z/4=6,求x,y,z 6x+3y-2z=108,9x+7y-3z=212,3x-2y+5z=38,求x,y,z 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? x/10 = y/8 =z/9 求x+2y+3z/y-5z 6x-y-z=3 2x-4y+8z=5 3x-6y-z=10 y z 分别等于几?大虾 x+2y+3z=23 y-z=5 x+2z=10 ..1.x+y+z=26,2.4y+3z=7,y-z=1,3x+2z=17,x+2y-z=18 9x-7y=173.x-7y+3z=17 4.2x+4y+3z=95x-6y-z=24 3x-2y+5z=113x+7y-2z=1 5x-6y+7z=131.x+y+z=26,y-z=1x+2y-z=18 2.4y+3z=7,3x+2z=11,9x-7y=17 3.x-7y+3z=17 5x-6y-z=24 3x+7y-2z=14.2x+4y+3z=93x-2y+5z=11 5x-6y+7z=13