问题描述：
Pay attention to y=ax^2+bx+c(a≠0), and answer the question.
If the two roots of this equation are m&n, which situation can be m0
or
m>0, n
Note: y=0 (I typed wrong.)
If the two roots of this equation are m&n, which situation can be m0
or
m>0, n
Note: y=0 (I typed wrong.)
问题解答：
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