请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6

请高手帮我解几道3元1次的方程组!好的100分,
x+2y+3z=15
x-y+7z=20
x+3y+2z=14
x+y-z=3
y+z-x=5
z+x-y=7
x+y-z=0.5
x-3y+2z=0
3x+2y-z=2
3x-2y=1
2y+3z=2
x+5z=3
15x-3y+2z=1
3x+4y-z=-18
z=13
6x-y-z=3
2x-4y+8z=5
3x-6y-z=10
x+y=3
y+z=5
x+z=6