Ed -

Very user friendly, if you break it down.

Ctl-F9 inserts a field.
eq names an "equation field" which can use a whole bunch of different "switches"
\x is a switch that says "put a box around whats in the parentheses that follow"
\a is a switch that says "make an array of what's in the next parentheses"
\f is a switch that says "make a fraction of what's in the next parentheses."
1 is the numerator, and 2 the denominator of the fraction, separated by a comma
The whole \f(1,2) is the top row of the array - defaulted to a 2x1 since I didn't add any rows/columns specification.
\x(99) is the lower row of the array,
but the \x switch says "put a box around the 99"

If you learn the switches one at a time, they are easy, fast, and very precise in what they do.

I could have given the example {eq \x(A)} - which is a quick 9 keystrokes, to show the letter A inside a box; but it's so much fun I couldn't resist showing off a little. It's certainly no more difficult than selecting a box in your spreadsheet, formatting it to a desired size (row height and column width), and then applying a border format. It's still a box.

For an alternative, do the Ctl-F9, and type an "=" followed by an equation of your choice, and then hit F9.
{=29*14/33} turns into 12.3
For more precision {=29*14/33 \#0.0000} turns into 12.3030. (the \#0.0000 tells it to show four decimal places)
For variety {=29*14/33\*HEX} turns into "C" - the hexadecimal integer equivalent of 12.3

It's so quick and easy I almost never use a calculator if I have Word open. But you have to learn how to drive it.

And how would you do the same layout in the wp of your choice???

John