Please help me this problem.

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Please help me this problem.
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Please help me this problem.
Please help me this problem.

Please help me this problem.
2x-y+3z=9 (1)
x-6y-z=0 (2)
-6x+3y-9z=24 (3)
(3)/(-3)
2x-y+3z = -8
but from (1) 2x-y+3z=9
=> no solution
ans:C

注意观察方程组中第一个和第三个：
将第一个左右都乘以（-3），发现-6x+3y-9z=-24，与第三个矛盾，因此无解。选C

c
由2x-y+3z=8得6x-3y+9z=24
和-6x+3y-9z=24是矛盾的

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