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20 13 Shaanxi senior high school entrance examination math problem 10 detailed explanation. . . . urgent
1, and the vertex y0 is the smallest, then the parabolic opening is upward.

2,-5<3, and y1>; Y2, then there are two possibilities for A and B. One is that A and B are on the left of the center line, and then x0 >;; 2. A and B are on both sides of the midline, and point A is higher than point B. When A and B are symmetrical about the midline, x0=- 1, so x0 >;; - 1