HP -225 Owner's Manual page 42

Scientific calculator
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Keys:
Display:
9(+]12 (%]
12,0000+
3 (=]
13.0000
Calculate 4 X 73 plus 5 x 72 plus 6.
4 (x] 7 [¥)
7.0000"
3
1,372.0000+
5 (x]
5.0000x%
7 [¥*]
7.0080"
2
~ 2
1,617.0000+
6 (=]
1,623.0000
Description:
Pressing (+] does not
add 9 + 12.
(*] has higher priority
than [x].
Calculates 4 x 73.
(x] has higher priority
than [+].
(*] has higher priority
than [+].
Adds 5 x 72 to 1,372.
Completes the
calculation.
If a calculation requires that operations be done in an order inconsis-
tent with operator priority (for example, addition before
multiplication), use parentheses.
Using Parentheses in Calculations
Use parentheses to group operations and to specify the order in which
they are performed.* For example, you can calculate:
9+ 12
3
by placing parentheses around the addition so that it is done before
the division:
* Closing parentheses at the end of the expression can be omitted. For example,
25+(3x(9+12 (=] is equivalent to 25+(3x(9+12)>> [=].
34
2: Arithmetic and Variables

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