Math: How to typeset a fraction that is part of a fraction?

Question

Kindly help me to typeset this equation using latex

Answer 1

Since your comment implied that this question is about typesetting, here you go:

\documentclass{memoir}

\usepackage{amsmath}
\usepackage{sagetex}

\begin{document}
\begin{align*}
    \log\frac
        {\frac{25}{16} \times \frac{32}{49}}
        {\frac{5}{7} \times \frac{5}{7}}
        &=\log \frac
            {\frac{50}{49}}
            {\frac{25}{49}}\\
        &=\log 2.\\
\intertext{The following lines utilize \texttt{sagetex}:}
    \frac
        {\frac{25}{16} \times \frac{32}{49}}
        {\frac{5}{7} \times \frac{5}{7}}
        &=\sage{(25/16*32/49)/(5/7*5/7)},\\
    \log\frac
        {\frac{25}{16} \times \frac{32}{49}}
        {\frac{5}{7} \times \frac{5}{7}}
        &=\log\sage{(25/16*32/49)/(5/7*5/7)},\\
    \log\frac
        {\frac{25}{16} \times \frac{32}{49}}
        {\frac{5}{7} \times \frac{5}{7}}
        &=\sage{log((25/16*32/49)/(5/7*5/7))}\\
        &\approx\sage{log((25/16*32/49)/(5/7*5/7)).n()}.
\end{align*}
\end{document}

It is not that easy to set up sagetex correctly but might be worth a try, see https://www.ctan.org/pkg/sagetex and https://www.sagemath.org. There might be better ways to put it in good use. Observe that sage's log is the natural logarithm by default. If sagetex has not been set up correctly, you might erase or comment out all lines containing "sage".

This is not the same typeface, though.

See also What are good learning resources for a LaTeX beginner?.

Answer 2

Confirming the same comment of the very good user @David Carlisle, I have finded, for example, a package (if it is truly the question) named calculator, where it is possible to calculate expressions with LaTeX. I think of it as a kind of algorithm that you should create manually.

Personally for complicated expressions I think it takes a long time to build an algorithm and it is easier to use a scientific calculator. I have created, although not very clearly in the first part, an algorithm that would permit me after, in the frame of the image colored in red, to be able to have the solution of your mathematical expression:

    \begin{align*}
    \log \frac{\frac{25}{16}\times \frac{32}{49}}{\frac{5}{7}\times \frac{5}{7}}
    &= \log \frac{\solE}{\solD}\\
    &= \log{\solF}=\sol
    \end{align*}

Here there is my complete proposal using this package:

%% Compile and read me!
\documentclass[a4paper,12pt]{article}
\usepackage{parskip}
\usepackage{calculator}
\usepackage{mathtools}


\begin{document}
% \solA
\DIVIDE{25}{16}{\solA}
$25/16=\solA$,

% \solB
\DIVIDE{32}{49}{\solB}
$32/49=\solB$,

% \solC
\DIVIDE{5}{7}{\solC}
$5/7=\solC$,

% \solD
\MULTIPLY{0.71428}{0.71428}{\solD}
$0.71428\times0.71428=\solD$,

% \solE
\MULTIPLY{\solA}{\solB}{\solE}
$\solA\times\solB=\solE$,

% \solF (divide argument of the logarithm)
\DIVIDE{\solE}{\solD}{\solF}
$\solF$

% \sol
\LOG{\solF}{\sol}
$\log{\solF}=\sol$

Otherwise more simply:

\begin{align*}
\log \frac{\frac{25}{16}\times \frac{32}{49}}{\frac{5}{7}\times \frac{5}{7}}
&= \log \frac{\solE}{\solD}\\
&= \log{\solF}=\sol
\end{align*}



\end{document}

After, as addendum, it is very important to read this article where there is a complete explanation between the calculator and calculus (also into calculator package - http://mirrors.ctan.org/macros/latex/contrib/calculator/calculator.pdf) packages written by Robert Fuster. Here there is a short example:

\documentclass[a4paper,12pt]{article}
\usepackage[russian,english]{babel}
\usepackage{calculus}%<--------Example 10
\begin{document}
% g(t)=1+cos(t)
\SUMfunction
{\ONEfunction}{\COSfunction}
{\gfunction}
% F(t)=g(t)^2
\COMPOSITIONfunction
{\SQUAREfunction}{\gfunction}
{\Ffunction}
% sol=F(pi/3), Dsol=F’(pi/3)
\Ffunction{\numberTHIRDPI}{\sol}{\Dsol}
\noindent If $f(t)=(1+\cos t)^2$,
then $f(\pi/3)=\sol$ and $f'(\pi/3)=\Dsol$.
\end{document}