题目应是x+y-z=6 (1)x+3y+2z=1 (2)3x+2y-z=4 (3)(1)-(2)x+y-z-x-3y-2z=6-1-2y-3z=5 (4)(1)*3-(3)3x+3y-3z-3x-2y+z=18-4y-2z=14 (5)(5)*2+(4)2y-4z-2y-3z=28+5-7z=33z=-33/7y=32/7x=-23/7
x+y-z=6,x+3y+2x=1,3x+2y-z=4
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