Casio fx-991ES PLUS User Manual

8
Permutation (nPr), combination (nCr), complex number polar
coordinate symbol (∠)
9 Dot product (•)
10 Multiplication (×), division (÷)
11 Addition (+), subtraction (-)
12 and (logical operator)
13 or, xor, xnor (logical operators)
Note
• When squaring a negative value (such as -2), the value being squared must be
enclosed in parentheses ( 2 ). Since x
2
has a higher priority than
the negative sign, inputting
2 would result in the squaring of 2 and then
appending a negative sign to the result.
• Always keep the priority sequence in mind, and enclose negative values in
parentheses when required.
Calculation Ranges, Number of
Digits, and Precision
The calculation range, number of digits used for internal calculation, and
calculation precision depends on the type of calculation you are
performing.
Calculation Range and Precision
Calculation Range ±1 × 10
-99
to ±9.999999999 × 10
99
or 0
Number of Digits for
Internal Calculation
15 digits
Precision
In general, ±1 at the 10th digit for a single
calculation. Precision for exponential display is
±1 at the least significant digit. Errors are
cumulative in the case of consecutive
calculations.
76

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