Casio fx-570ES - Specifying Complex Number Display Format; Rectangular vs. Polar Coordinate Display

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Casio FX-570ES One Page Exercise:
FRACTIONS
>>> Perform this fraction calculation
6
5
5
2
+ .
What To Do The Screen Display
First turn on the calculator and set calculator to “COMP” mode.
W w 1
Now press the fraction key, and then enter the first fraction.
a
2 R 5
Move cursor to the right of first fraction and enter the operation “+”.
$ +
Now enter the second fraction.
a 5 R 6
Press “=” to get the result. You can also display result in proper form.
p
q nN