Casio SERIES FX-9860G - Manual (Page 545)

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u To change −2X 2 + 2 to 2X 2 + 2 (by deleting the - key)
1. This will display the - key editing screen.
2. Press 5(DEL).
3. Press 1(Yes).
• This will delete the - key and display the guide
creation screen from the next key ( c key).
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eActivity Guide