Casio fx-991ES PLUS User Manual

(BASE) (Not) 1010 1111111111110101
Example 6: To negate (take the two's complement) of 101101
2
(Neg(101101
2
))
(BASE) (Neg) 101101 1111111111010011
Note
• In the case of a negative binary, octal or hexadecimal value, the calculator converts
the value to binary, takes the two's complement, and then converts back to the original
number base. For decimal (base-10) values, the calculator merely adds a minus sign.
Equation Calculations (EQN)
You can use the following procedure in the EQN Mode to solve
simultaneous linear equations with two or three unknowns, quadratic
equations, and cubic equations.
1. Press
(EQN) to enter the EQN Mode.
2. On the menu that appears, select an equation type.
To select this
calculation type:
Press this key:
Simultaneous linear
equations with two
unknowns
(a
n
X + b
n
Y = c
n
)
Simultaneous linear
equations with three
unknowns
(a
n
X + b
n
Y + c
n
Z = d
n
)
Quadratic equation (aX
2
+ bX + c = 0)
Cubic equation (aX
3
+ bX
2
+ cX + d = 0)
3. Use the Coefficient Editor that appears to input coefficient values.
59

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