8x+6y+6z=118 2y+1z=20 x+y+z=18 x=5 y=7 z=6 我是8x+6y+6z=1182y+1z=20x+y+z=18x=5y=7z=6我是个文盲,小学都没上完,所以像这种题我不懂,

x+y+z=6 x+2y+3z=14 y+1=z x+y+z=18,8x+6y+6z=118,2y+z=20求解过程 若x+y=6,xy=-8,求代数式(x+y-z)^2+(x+y-z)(x+y+z)-2·z(x-y) 若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知X.Y.Z满足方程组,X+y-Z=6y+z-x=2z+x-y=0求X.Y.Z的值 (1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1. x=2y-9z x+2y-3z=2 x-2y+6z=1 三元一次方程x-y+z=6 x+y-z=0 2x+3y+8z=33 三元一次方程 X+Y+Z=6 2X+3Y-Z=4 3X-Y+Z=8 x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5 x+y-z=6 x-3y+2z=1 3x+2y-z=4 阿 x+y-z=6,x-3y+2z=1,3x+2y-z=4 x+y-z=6 x-3y+2z=1 3x+2y-z=4 x+y+z=1 4x+5y-z=6 x+2y-z=3 x+y-z=6 x-3y+2z=1 3x+y-z=4 {x-y+z=6,x+3y=-1,y+2z=3 方程组：{x+y-z=6,x+z=16,x-y+2z=17