latex large division sign in a math formula [closed]

Question

I have been looking for an answer for some time now, hope you could give me a quick tip.

I have an equation with many divisions inside. i.e:

$\frac{\frac{a_1}{a_2}} {\frac{b_1}{b_2}}$ 

To make it more readable, I decided to change the large fraction into "/" sign. i.e.

$\frac{a_1}{a_2} / \frac{b_1}{b_2}$ 

The problem is that the "/" sign remains small, and it is quite ugly.

How do I change the "/" sign to have a big font? How do I make it more readable?

Answer 1

I found the answer I was looking for. The thing to use here is the construct of

\left \middle \right 

For example, in this case, two possible solutions are:

$\left( {\frac{a_1}{a_2}} \middle/ {\frac{b_1}{b_2}} \right) $ 

Or, in case the brackets are not necessary:

$\left. {\frac{a_1}{a_2}} \middle/ {\frac{b_1}{b_2}} \right. $ 

Answer 2

Another option is to use \dfrac instead of \frac, which makes the whole fraction larger and hence more readable.

And no, I don't know if there is an option to get something in between \frac and \dfrac, sorry.