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例如图1,抛物线y=ax~2+bx+c的对称轴是直线x=-1,且过点(1/2,0).有下列结论:(1)abc>0;(2)a-2b+4c=0;(3)25a-10b+4c=0;(4)3b+2c>0;(5)a-b≥m(am-b).其中,所有正确的结论是(填写正确结论的序号).分析本题考查二次函数的图象与性质.二次函数y=ax~2+bx+c(a≠0)中的系数与
For example, in Figure 1, the axis of symmetry of the parabola y = ax ~ 2 + bx + c is a straight line x = -1 with a point of 1 / 2,0 and has the following conclusions: (1) abc> 0; -2b + 4c = 0; (3) 25a-10b + 4c = 0; (4) 3b + 2c> 0; ). Analysis of the problem to examine the quadratic function of the image and the nature of the quadratic function y = ax ~ 2 + bx + c (a ≠ 0) in the coefficient and