Thanks for the feedback. Yes this is where I am confused because earlier in the book they mention when a whole number is sitting next to a fraction, it is the same as addition as shown in the attached image.
But for the example I used in the original post, 2 1/x+1, that does not have a multiplication symbol - so that is a typo then? Because otherwise according to the book this would be the equivalent of 2 + (1/x+1) with no sign.
ok... what's going on here is the difference between two numbers associated together via an operator vs. 2 numbers that make up a single number that includes a fraction.
For example consider the expression $2\dfrac 1 4$
This certainly can mean the single number that is equivalent to $2+\dfrac 1 4 = \dfrac 9 4$
It also can stand for $2 * \dfrac 1 4 = \dfrac 1 2$
It's really impossible to tell which without context.
I would add that using the first form with anything but strictly numbers is rarely if ever seen.
So the expression $2\dfrac {1}{x+1}$ would always stand for $2 * \dfrac{1}{x+1}$ and not $2 + \dfrac{1}{x+1}$
You have been doing advanced math for too long. The OP is, indeed, correct that in very basic level mathematics texts, a "mixed fraction" is one that includes whole numbers plus a fraction (and the plus sign is assumed).
https://www.mathsisfun.com/mixed-fractions.html