11Y+11Z=X 7Y+7Z+7Y=X 7Y+7Z+（1.8x4）Y=X+4这个三元一次方程怎么解?没有学过啊……

fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 50=11+x+y=7+x+z=y+13+z x=?y=?z=? {x+2y+3z=11,x-y+7z=10,x+3y+2z=2 x+2y+3z=14 2x+y+z=7 3x+y+2z=11 x+2y+4z=17 2x+y+z=7 3x+y+2z=11 1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38 x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? 三元一次方程 X-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 X=?Y=?Z=? x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z x-4y+z=-302x+y-z=18x--y-z=7 x+y+z=14 7z=x+y+2 x+z=y 2x+3y-z=11 2x+y-5z=8 -2+7y+z=19 ..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 三元一次方程：x+3y+2z=2 3x-y+2z=3 3x+2y-4z=3 2x+y-3z=11 2x-y=7 x+y+z=12还有：7x+2y-z=76x-y+z=74x+3y+z=9 好了,2x+y-3z=11 2x-y=7x+y+z=12 (1)2X+4Y+3Z=93X-2Y+5Z=115X-6Y+7Z=13(2)X:Y=3:2Y:Z=5:4X+Y+Z=66(3)3X-Y+Z=32X+Y-3Z=11X+Y+Z=13以上3个题目为三元一次方程~ 4x+9y=12 3y-2y+5z=11 5x-6y+7z=13 求：x y z等于多少