Casio fx-991ES PLUS User Manual

2 (,) 16 4
(MthIO-MathO, MthIO-LineO) 2 16 4
Example 3: log
2
(4
3
) = 6 (MthIO-MathO, MthIO-LineO)
2 (x
3
)
6
Example 4: log
2
(4)
3
= 8 (MthIO-MathO, MthIO-LineO)
2 4 (x
3
)
8
Example 5: To calculate ln 90 (= log
e
90) to three significant digits (Sci 3)
(SETUP) (Sci)
90
4.50×10
0
Power Functions and Power Root
Functions
Note that the input methods for
, , , and are different
depending upon whether you are using Natural Display or Linear Display.
Example 1: 1.2 × 10
3
= 1200 (MthIO-MathO)
1 2 10 3 1200
Example 2: (1 + 1)
2+2
= 16 (MthIO-MathO)
1 1 2 2 16
Example 3: (5
2
)
3
= 15625
5 (x
3
)
15625
Example 4:
5
√32 = 2
(MthlO-MathO) ( ) 5 32 2
(LinelO) 5 ( ) 32 2
Example 5: To calculate √2 × 3 (= 3√2 = 4.242640687...) to three decimal
places (Fix 3)
(SETUP)
(Fix)
29

Casio fx-991ES PLUS Specifications

General

Type	Scientific
Cover	No
Form factor	Desktop
Control type	Buttons
Product color	Gray
Digits	15 digits
Display type	Dot-matrix
Display resolution	96 x 31 pixels
Display number of lines	10 lines
Storage media type	Not available
Battery life	3 year(s)
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Symbolic notation	Square root
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	162 mm
Width	80 mm
Height	11.1 mm
Weight	95 g