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                                                   x  3                           x   1
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                           Cho  biểu  thức  :  M         Tìm  x         Cho  P        . ĐKXĐ :  x   Tìm
                                                   x   2                          x   9

                thỏa mãn  M   x       0                      các số nguyên x để  P   1
                                M
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