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You should feel happy that your calculator can perform some exact calculations. If you do not want the exact values you can press the SD key. You can also press SHIFT EXE rather than EXE alone.
Sorry, but the fx-115ES can only display square roots in radical form. Cube roots are beyond its symbolic capabilities and will always be in decimal form.
The capability of these calculators to handle irrational numbers in radical form is limited to square roots. Roots of index other than 2 are always displayed in their decimal representation. If the calculator IO mode is set to MathIO, square roots will be displayed with the radical symbol. More complicated expressions with square roots might not be preserved and will be given as decimal numbers.
Square root of 39 IS the exact answer, as the result will be a surd (an irrational number with too many - or potentially infinite decimal places).
If you have been asked to round or show your answer to a number of decimal places then you use the answer toggle (the opposing arrows button above enter) to receive an approximation - a rounded answer (6.24 to two d.p. if you were to multiply these together you will see it is close to 39, but not EXACT, because it has been rounded already). You can also press the answer toggle again to see a longer decimal, but again this is rounded and not exact
You cannot. The calculator does not have the Natural Display (math display) feature. I have heard that you can flash it with the OS of an FX-9860GII. At your own risk.
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