3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11 解方程组,

解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3 解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3 解方程组2x+y-z=7 x+y+z =1 2x-y-z=5 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 x:y:z=2:3:5解方程组 2x+3y-z=16 解方程组：x+3y=5.y-2z=5.x+z=5 解三元一次方程组：(1)x+2y+3z=11x-y+4z=10x+3y+2z=2(2)x:y=3:5y:z=5:6x+y 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x- 解下列方程组（1）3x-y+z=3 2x+y-3z=11 x+y+z=12（2）5x-4y+4z=13 2x+7y-3z 3x+2y-z=1 x-2y+2z=5 5x-2y+5z=11 解方程组, 解方程组：2x+2y+z=1 x-2y-3z=-13 3x+2y+5z=11