HP 48gII - Manual (Page 45)

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3.` Enter 3 in level 1
5.` Enter 5 in level 1, 3 moves to y
3.` Enter 3 in level 1, 5 moves to level 2, 3 to level 3
3.* Place 3 and multiply, 9 appears in level 1
Y
1/(3 ×3), last value in lev. 1; 5 in level 2; 3 in level 3
- 5 - 1/(3 ×3) , occupies level 1 now; 3 in level 2
* 3 Ч (5 - 1/(3Ч3)), occupies level 1 now.
23.`Enter 23 in level 1, 14.66666 moves to level 2.
3.Q Enter 3, calculate 23
3 into level 1. 14.666 in lev. 2.
/ (3 Ч (5-1/(3Ч3)))/23 3 into level 1
2.5 Enter 2.5 level 1
!¸
e 2.5 , goes into level 1, level 2 shows previous value.
+ (3 Ч (5 - 1/(3Ч3)))/23 3
+
e 2.5 = 12.18369, into lev. 1.
R √((3Ч (5 - 1/(3Ч3)))/23 3
+
e 2.5 ) = 3.4905156, into 1.
Although RPN requires a little bit more thought than the algebraic (ALG) mode,
there are multiple advantages in using RPN. For example, in RPN mode you
can see the equation unfolding step by step. This is extremely useful to detect
a possible input error. Also, as you become more efficient in this mode and
learn more of the tricks, you will be able to calculate expression faster and
will much less keystrokes. Consider, for example the calculation of (4
Ч6 -
5)/(1+4 Ч6 - 5). In RPN mode you can write:
4 ` 6 * 5 - ` 1 + /
obviously, even In RPN mode, you can enter an expression in the same order
as the algebraic mode by using the Equation writer. For example,
‚OR3.*!Ü5.-1/3.*3.
———————
/23.Q3™™+!¸2.5`
The resulting expression is shown in stack level 1 as follows:
Notice how the expression is placed in stack level 1 after pressing `.
Pressing the EVAL key at this point will evaluate the numerical value of that
expression Note: In RPN mode, pressing ENTER when there is no command