Mathematical convention for writing products using dots

Question

What would be the appropriate way of writing the following products involving numbers and variables (in LaTeX)?

• $2^{3}\cdot 5^{17}\cdot 11^{2}\cdot (x+y)$ $\qquad\text{or}\qquad$ $2^{3}\cdot 5^{17}\cdot 11^{2}(x+y)$

• $2^{3}\cdot 5^{17}\cdot 11^{2}\cdot x$ $\qquad\text{or}\qquad$ $2^{3}\cdot 5^{17}\cdot 11^{2}x$

Any other suggestions will be appreciated.

Answer 1

The use of conjunction, that is writing $ab$ instead of $a\cdot b$, is common to denote multiplication. So, any notation you use is likely to be understood, and both are common: \begin{align} a\cdot b\cdot cx && \text{or} && a\cdot b\cdot c\cdot x \end{align} is fine. The same goes for \begin{align} a\cdot b\cdot c(x+y) && \text{or} && a\cdot b\cdot c\cdot (x+y). \end{align}