Question

下列哪一个不等于 $\dfrac54$ ？

Which of the following is not equal to $\dfrac54?$

$\dfrac{10}{8}$

$1\dfrac14$

$1\dfrac{3}{12}$

$1\dfrac15$

$1\dfrac{10}{40}$

答案：D

知识点：分数

难度评级：560

解答：

$\dfrac54 = 1\dfrac14$ 。逐项检查： $\dfrac{10}{8} = \dfrac54$ ， $1\dfrac14 = \dfrac54$ ， $1\dfrac{3}{12} = 1\dfrac14 = \dfrac54$ ，且 $1\dfrac{10}{40} = 1\dfrac14 = \dfrac54$ 。

但 $1\dfrac15 = \dfrac65 \neq \dfrac54$ 。

所以正确答案是 D。

Note $\dfrac54 = 1\dfrac14.$ Now check each choice: $\dfrac{10}{8} = \dfrac54,$ $1\dfrac14 = \dfrac54,$ $1\dfrac{3}{12} = 1\dfrac14 = \dfrac54,$ and $1\dfrac{10}{40} = 1\dfrac14 = \dfrac54.$

But $1\dfrac15 = \dfrac65 \neq \dfrac54.$

Thus, the correct answer is D .

1992 AMC 8 第 2 题

答案：D

难度评级：560

解答：

其他年份的第 2 题