Đáp án:
Giải thích các bước giải:
có : (m + 3)x - 1 = m² - 9
<=> (m + 3 )x = m² -8
mà phương trình đã cho là phương trình bậc nhất nên
để phương trình đã cho vô nghiệm thì
m + 3 = 0
<=> m = -3
M=-3
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