ONE QUESTION, ONE STEP
ZX-DD07A5E8FA2024年8月B卷 · 第 21 题
2024年8月B卷 · 原库模块 2 · Q21 原库参考解析
\( f\left(x\right)=4\left(x-a\right)\left(x-b\right)\left(x-c\right) \)
The function \( f \) is defined by the given equation, where a, b, and c are distinct constants. When\( a<x<b \), the value of \( f\left(x\right) \) is positive. The graph of \( y=f\left(x\right) \) in the xy-plane contains the point \( \left(r,\ s\right) \), where r and s are constants. If \( s=3 \), which of the following could be true?
Ⅰ.\( r<a \)
Ⅱ.\( b<r<c \)
Ⅲ.\( r>c \)
参考答案：
解题思路
容易忽略的一步
