1971 AMC 12 第 8 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
8.
不等式 的解集是满足下列哪一条件的所有 ：
The solution set of is the set of all values of such that:
或
or
或
or
小提示：
把 移到左边并因式分解
Move to the left and factor
大提示：
乘积 在两个根之间为负
The product is negative between its roots
解答：
该不等式等价于 两个根是 和 ，开口向上的二次函数在两根之间为负。
因此，正确答案为 B。
The inequality is The roots are and and the upward-opening quadratic is negative between them.
Therefore, the correct answer is B.
其他年份的第 8 题
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