Please help me this problem.
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Pleasehelpmethisproblem.Pleasehelpmethisproblem.Pleasehelpmethisproblem.2x-y+3z=9(1)x-6y-z=0(2)-6x+3
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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