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Master Ta (Koucai \ Wei /:2 6 ⒏ 3, 1 4,⒌)
Anti-bow road: it is not appropriate to have "anti-bow road" in the front, back and left of a house. The so-called "heartless" people are disobedient children, disloyal subordinates, employees who are difficult to retain, and people who are not harmonious inside and outside. There will be lotus flowers, accidents, bad official luck, love affairs, and it will be more prone to disasters. Regarding the cause and symptoms, it will be broken according to the direction of the road.
1. The symmetry axis is a straight line X = 1, -b/(2a) = 1, and b =-2a.
a & lt0,b & gt0
y=ax^2+bx+c=y=ax^2-2ax+c
The intersection point (x 1, 0) of the parabola and the x axis satisfies 4 > x 1 > 3.
The other intersection point must be on the negative semi-axis of x, and C >;; 0
abc & lt0,3a+b = 3a-2a = a & lt; 0
4 > x 1 > 3, when x = 4, y must be greater than 0, that is, 8a+c >;; 0
a+b = a-2a =-a & gt; 0
All four conclusions are correct.