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2016年长沙市中考数学试卷第12题是一道选择题,得分率不足千分之三,仔细阅题,发现得分率不高的原因在于四个结论中,对(4)的判断有一定的难度。不过对于初中学生来讲,这道题难度确实不小,我在网上搜索的解答方法,使我不觉陷入了沉思……题目如下:已知抛物线y=ax~2+bx+c(b>a>0)与x轴最多有一个交点,现有以下四个结论:
2016 Changsha City Entrance Examination Mathematics Question 12 is a multiple choice questions, scoring less than three thousandths, carefully reading questions and found that the score is not high because the four conclusions, the judge (4) a certain degree of difficulty . However, for junior high school students, the difficulty of this issue is indeed not small, I search the Internet solution, so I do not feel lost in meditation ...... Subjects are as follows: Parabolic known y = ax ~ 2 + bx + c (b> a> 0) has at most one intersection with the x axis, the following four conclusions are as follows: