vậy còn câu này:
$x_{1}+2x_{2}+4x_{3}-3x_{4}=0; 3x_{1}+5x_{2}+6x_{3}-4x_{4}=0; 4x_{1}+5x_{2}-2x_{3}+3x_{4}=0; 3x_{1}+8x_{2}+24x_{3}-19x_{4}=0$
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There have been 3 items by meomun (Search limited from 07-06-2020)