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Which expression is equivalent to [tex]\left(\frac{125^2}{125^{\frac{4}{3}}}\right)[/tex]?

A. [tex]\frac{1}{25}[/tex]

B. [tex]\frac{1}{10}[/tex]

C. 10

D. 25


Sagot :

To determine which expression is equivalent to [tex]\(\left(\frac{125^2}{125^{\frac{4}{3}}}\right)\)[/tex], we need to simplify the given expression step by step.

Let's start with the expression:

[tex]\[ \left(\frac{125^2}{125^{\frac{4}{3}}}\right) \][/tex]

Using the properties of exponents, specifically the rule [tex]\(\frac{a^m}{a^n} = a^{m-n}\)[/tex], we can combine the exponents in the numerator and the denominator as follows:

[tex]\[ \frac{125^2}{125^{\frac{4}{3}}} = 125^{2 - \frac{4}{3}} \][/tex]

Next, we need to simplify the exponent [tex]\(2 - \frac{4}{3}\)[/tex]. To do this, we find a common denominator for the fractions. The common denominator between 2 (which can be written as [tex]\(\frac{6}{3}\)[/tex] for consistency) and [tex]\(\frac{4}{3}\)[/tex] is 3:

[tex]\[ 2 - \frac{4}{3} = \frac{6}{3} - \frac{4}{3} = \frac{6-4}{3} = \frac{2}{3} \][/tex]

So, we have:

[tex]\[ 125^{2 - \frac{4}{3}} = 125^{\frac{2}{3}} \][/tex]

At this point, we need to evaluate [tex]\(125^{\frac{2}{3}}\)[/tex]. The exponent [tex]\(\frac{2}{3}\)[/tex] means taking the cube root of 125 and then squaring the result.

First, the cube root of 125 is:

[tex]\[ \sqrt[3]{125} = 5 \][/tex]

Then, we square the result of the cube root:

[tex]\[ 5^2 = 25 \][/tex]

Hence, we find that:

[tex]\[ 125^{\frac{2}{3}} = 25 \][/tex]

Therefore, the expression [tex]\(\left(\frac{125^2}{125^{\frac{4}{3}}}\right)\)[/tex] simplifies to 25.
Thus, the correct answer is:

[tex]\[ \boxed{25} \][/tex]
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