x=64/19
y= - 4/19
z=21/19
由（1）得z=2x+3y-5将其代入（2）,（3）式可算出x和y,最后将算出的xy代入可得z
解方程组 2x+3y-z=5 x-2y+2z=6 3x-y-3z=7
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