HP HP-28S - Chain Calculations

Chain Calculations
When you perform complicated calculations, the stack acts as tempo-
rary storage to hold intermediate results. This temporary storage acts
automatically. For example,
suppose you want to calculate the total
resistance
of the following circuit:
The formula for total resistance in this circuit is:
1
If R
1
,
R
2
,
and R3 have resistances of 8, 6, and 3 ohms respectively,
calculate
the following:
Calculate as follows:
Put 8 on the stack.
8 [ENTER I
1
8 + 1
+
6 3
You'll leave 8 on the stack until it's time to add it to the rest of the
calculation.
2: Doing Arithmetic 45