Which of the following is not equal to (5/4) ?

AMC 8 1992 Problem 2

AMC8 1992 年第 2 题

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Which of the following is not equal to

\dfrac{5}{4}

以下哪个不等于

\dfrac{5}{4}

？

正确答案 · Correct Answer

Solution 1

The fraction in question is equal to $1.25$. Expressing all of the choices we have,

\text{(A)}1.25 \qquad \text{(B)}1.25 \qquad \text{(C)}1.25 \qquad \text{(D)}1.2 \qquad \text{(E)}1.25

It's clear then that choice

\text{D}

is the answer.

A quick glance shows that

\text{D}

is the only answer with a denominator that does not have 4 as a factor, so it is unlikely that it will simplify into

\displaystyle \frac{5}{4}

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