Texas Instruments TI-89 사용자 설명서

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Note:
 Reexecuting an entry “as is” is useful for iterative calculations that involve 
variables.
Using the equation 
A=
p
r
2
, use trial and error to find the radius of a circle that covers 200 
square centimeters.
Note:
 Editing an entry lets you make minor changes without retyping the entire entry.
The example below uses 8 as the first guess and then displays the answer in its 
approximate floating-point form. You can edit and reexecute using 
7.95
 and continue 
until the answer is as accurate as you want.
¸ ¸
TI-89 Titanium
Display
8 
§
 
j
 R 
Ë
2
 
T
 
j
 R 
Z
 2
¸
8 ¸
TI-89 Titanium
Display