LaTeX Efficient Fractional Latex Code for Simplifying Equations

[mech-eng]

How can this code be coded by another way?

$\frac {300-270.1}{T-130}$ = $\frac {313.-270.1}{135-130}$

And it is also very strange that the right side O.K but left side is not but everything is the same for left and right.

#,# \frac {300-270.1}{T-130}$=$ \frac {313.-270.1}[135-130}#,#

Thank you.

 

[jedishrfu]

I don't see a problem. On the right, you have 313. and on the left you have 300 no dot.

The denominator is centered under the numerator too. It looks pretty good.

 

[mech-eng]

I don't see a problem. On the right, you have 313. and on the left you have 300 no dot.

The denominator is centered under the numerator too. It looks pretty good.

But even though code is written with ## it doesn't seem to be in bold type. What is the problem, it shoud have been in bold type.

Thank you.

 

[mech-eng]

I would like to ask about this code:

Above code is from here: https://www.physicsforums.com/help/latexhelp/

I am confused because \frac 1 2 should be seem as $\frac 1 2$. Why it does not work in the rendered code?

Thank you.

 

[fresh_42]

I would like to ask about this code:

View attachment 200285

Above code is from here: https://www.physicsforums.com/help/latexhelp/

I am confused because \frac 1 2 should be seem as $\frac 1 2$. Why it does not work in the rendered code?

Thank you.

Not quite sure what you mean. If you write \text{ then anything in those brackets is plain text, whether it is a formula \frac{1}{2} or not }.
Outside this \text{ } command, you get $\frac 1 2 = \frac{1}{2}$ if in formula mode. You even get it inside, as # # ... # # interrupts the \text{ } environment.

 

[mech-eng]

Not quite sure what you mean. If you write \text{ then anything in those brackets is plain text, whether it is a formula \frac{1}{2} or not }.
Outside this \text{ } command, you get $\frac 1 2 = \frac{1}{2}$ if in formula mode. You even get it inside, as # # ... # # interrupts the \text{ } environment.

This was what exactly I ask. But what does "plain roman text" mean? Would you explain this concept in a most simple way?

Thank you.

 

[fresh_42]

It just means text. You can have a # # ... # # environment with a \text{} or \textrm{} command in between. E.g. if one writes a long formula, or a formula embedded in $ $ ... $ $, then it is often convenient to insert short text entries like "and" or "such that" without having to leave the math mode, e.g.
$$
\forall x \in X \text{ and } \forall y \in X \; \exists z \in X \textrm{ such that } x + y = z
$$
which is written as
$ $
\forall x \in X \text{ and } \forall y \in X \; \exists z \in X \textrm{ such that } x + y = z
$ $