Texas Instruments TI-89 Manuale Utente
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Constants and Measurement Units
282
Using Parentheses with Units in a Calculation
Using Parentheses with Units in a Calculation
Using Parentheses with Units in a Calculation
Using Parentheses with Units in a Calculation
In a calculation, you may need to use parentheses ( ) to group a value and its units so
that they are evaluated properly. This is particularly true for division problems. For
example:
that they are evaluated properly. This is particularly true for division problems. For
example:
Note:
If you have any doubt about how a value and its units will be evaluated, group
them within parentheses ( ).
Here’s why you get unexpected units if you do not use parentheses. In a calculation, a
unit is treated similar to a variable. For example:
unit is treated similar to a variable. For example:
100_m
is treated as
100
†
_m
and
2_s
is
treated as
2
†
_s
. Without parentheses, the entry is calculated as:
100
†
_m / 2
†
_s =
†
_s = 50.
†
_m
†
_s
.
To calculate:
Enter:
100_m
2_s
-----------------
100_m/(2_s) 50 •
_m
_s
-------
You must use parentheses
for (2_s). This is important
for division.
for (2_s). This is important
for division.
100_m/2_s 50.
†
_m
†
_s
If you omit the parentheses,
you will get unexpected units.
For example:
you will get unexpected units.
For example:
100*_m
2
--------------------