• Answer memory contents are not change if an error occurs
during the current calculation.
•Answer memory contents are mainiained even if you press
the [AC]key, change the calculation mode, or turn off the
calculator.
Example: 258
456 = 714
987714 = 273
[2] [5] [8] [] [4] [5] [6] [=]
[9] [8] [7] [
] [Ans] [=]
• If you need to recall Answer Memory contents after pressing
[AC], press [Ans] [=] key.
Independent Memory
Addition and subtraction (to and from sum) results can be
stored directly in memory.Results can also be totalized in
memory, making it easy to calculate sums.
• You can insert the “M” variable into a calculation, which tells
the calculator to use the current independent memory
contents at that location. The following is the key operation
for inserting the “M” variable.
[ALPHA] [M+] (i.e. the character “M”)
•The “M” indicator appears in the upper left of the display
when there is any value other
zero stored in independent
memory.
•Independent memory contents are maintained even if you
press the [AC] key, change the calculation mode, or turn off
the calculator.
To clear the independent memory contents, press
[0] [SHIFT] [RCL] [M+]
This clears independent memory and causes the “M” indicator
to disappear from the display.
Example: 38
9 = 47 [3] [8] [] [9] [M+]
) 458 = 37 [4] [5] [] [8] [M+]
) 273 = 81 [2] [7] [] [3] [SHIFT] [M+]
) 964 = 24 [9] [6] [] [4] [M+]
(Total) 27 [RCL] [M+] (i.e. “M”)
Variable memories
Six variables named A, B, C, D, X, and Y can be used for storage
of individual values at the same time, and can be recalled
when desired.
• You can assign a specific value or when formulas are input,
the result of the formula’s calculation to a variable.
•To check the contents of a variable, press [RCL] then the
corresponding key for the variable.
Example: to recall the contents of variable A, press
press [RCL] [(–)]
• Variables can be used inside of an expression.
Example: to multiply the contents of variable A by the
contents of variable B
[ALPHA] [(–)] (i.e. “A”) [
] [ALPHA] [º ' "] (i.e. “B”)
•Variable contents are protected even when the power is
turned OFF.
Example:Input 123 into memory “A”
Input the result of 123
456 into memory “B”
Input the results of A
B into memory “C”
[1] [2] [3] [SHIFT] [RCL] [(–)]
[1] [2] [3] [] [4] [5] [6]
[SHIFT] [RCL] [º ' "]
[ALPHA] [(–)] [
]
[ALPHA] [º ' "] [=]
To clear the contents of a specific variable, press:
[0] [SHIFT] [RCL] and then press the key for the name of the
variable whose contents you want to clear e.g. press [(–)] for
the variable “A”.
The contents of all memories can be cleared at the same time
by pressing
[SHIFT] [9] [2]
then press [=] to confirm the operation or press
[AC] to cancel this operation.
“CALC” function
•The CALC function lets you input a calculation expression
that contains variables, and then assign values to the
variables and perform the calculation.
• You can use the CALC in the COMP Mode ([MODE] [1]) and in
the CMPLX Mode ([MODE] [2]).
The following types of expression can be used with CALC.
• Expressions that contain variables
Example: 2X + 3Y, 5B + 3i, 2AX + 3BY +C
• Multi-statements
Example: X + Y : X (X + Y)
• Expressions with a single variable on the left
Example: {variable} = {expression}
The expression on the right of the equal sign (input using
[ALPHA] [CALC] [=]) can contain variables.
Example: Y = 2X, A = X
2
+ X + 3
To start a CALC operation after inputting an expression, press
the [CALC] key.
LINE
[5] [
] [ALPHA] [(–)] (A)
[CALC]
Prompts for input
of a value for A.
Current value of A
[7] [=]
[CALC] (or [=])
[9] [=]
• To exit CALC, press [AC].
• If the expression you are using contains more than one
variable, an input prompt appears for each one.
“Solve” functions
The solve feature lets you solve an expression using variable
values you want without the need to transform or simplify the
expression. For example, in the expression "B=AX–5", you can
define A, B to findX, or define A, X to find B, or define B, X to find
A.
Newton's method is used for solving functions, in which, error
can occur. Certain expressions or initial values may result in
error without convergence of results.
Example: Y=AX
2
6X9
[AC] [ALPHA] [Y] [ALPHA] [=]
[ALPHA] [A] [ALPHA] [X] [X
2
]
[] [6] [ALPHA] [X] [] [9]
[SHIFT] [CALC] (SOLVE)
Prompts for input
of a value for Y.
Current value of Y
[0] [=]
[2] [=]
[=]
Solution Screen
• The “L–R=” (left side – right side form result) shows the result
when the obtained solution is assigned to the solution
variable. The closer this value is to zero, the higher is the
precision of the obtained solution.
• If you want to restart the function solving for the same
formula, you can press [=] once more to recycle the solving
procedure. You will be asked again to input the value for all
the variables.If you want to exit from solving function, press
[AC].
Function Calculations
The functions available to you depends on the calculation
mode you are in. The
explanations in this section are mainly
about the functions that are available in all calculation modes.
All of the examples in this section show operation in the COMP
Mode ( [MODE] [1] ).
Trigonometric functions and inverse trigonometric
functions
•The angle unit required by trigonometric and inverse
trigonometric functions is one specified as the calculator’s
default angle unit. Before performing a calculation, be sure
to specify the default angle unit you want to use.
Hyperbolic and Inverse Hyperbolic Functions
Pressing the [hyp] key displays
a menu of functions.
Press the number key that
corresponds to the function
you want to input.
2
3
2
3
2
3
2
3
1
3
4 +2
7
Math
4
3||
Math
4
3
+1||
Math
2+3||
√
---
Math
√
---
2+3+4||
Math
2
5
98
25
2
5
{
1 +
}
x2
Math
To selectthis mode
COMP
CMPLX
STAT
BASE-N
EQN
MATRIXTABLEVECTORFor this type of operationGeneral calculationsComplex number calculationsStatistical and regressioncalculationsBase-n calculations (binary,octal, decimal, hexadecimal)Equation solutionMatrix calculationsGeneration of a number tablebased on an expressionVector calculationsPress
Function Key Operation StepsImproper Fraction 9Mixed Fraction 13log(a, b) (logarithm) 6
10
x
(Power of 10) 4
e
x
(Power of e) 4Square Root 4Cube Root 9Square, Cube 4
5 lacorpiceR
Power 4Power Root 9
8 largetnI
6 evitavireD
∑ Calclation 8Absolute Value 4Parentheses 1[ ][SHIFT] [ ] ( )[log ][SHIFT] [log] (10 )[SHIFT] [In] (e )
[
√
---
]
[SHIFT] [
√
---
] (
3
√
---
)
[x
2
] , [SHIFT] [x
2
] (x
3
)
[x
–1
]
[x
]
[SHIFT] [x
] (
√
---
)
[∫][SHIFT] [∫ ] ( )[SHIFT] [log ] (
∑
)
[SHIFT] [hyp] (Abs)[ ( ] or [ ) ]
d
dx
1 :ab/c2 : d/c
3 : CMPLX4 : STAT
5 : Disp6 :CONT
3 2 13 3 15 2 90 78 1170
√
---
+
√
---
3+ 6
Math
√
---
69
Angle Unit
Selection
Input of
Angle Value
Input Value Range
for √
--
Form
Display
Deg Units of 15
º
|x| < 9
10
9
Rad
Multiples of
1
π radians
|x| < 20π
Gra Multiples of
50
grads |x| < 10000
__
12
__
3
a b
c
± --------- ± ---------
√
--
d e
f
√
--
√
---
+
√
---
5 449489743
Math
69cos (30
Math
3
2
√
---
/
√
--
√
--
√
--
------------ = 9.899494937cos
-1
(05
Math
π
1
3
/
± a* b ± d* e
c*
√
--
√
--
--------------------------
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
√
--
d
c
b
c
√
---
x
√
---
5 477225575
Math
56
√
---
x
√
---
30
Math
√
------
56
/
√
---
x
√
---
30
Math
√
------
56
/
(Linear format) CalculationExample Operation Result
Percentage
26% of $15.00
Premium
15% increase from
$36.20
Discount
4% discount from
$47.50
Ratio
75 is what % of 250?
Rate of change
141 is an increase of
what % from 120?
Rate of change
240 is a decrease of
what % from 300?
[1][5][
][2][6][SHIFT][ ( ]
[=]
[3][6][
•
][2][][3][6][
.
][2]
[][1][5][SHIFT][ ( ][=]
[4][7][
•
][5][][4][7][
.
][5]
[][4][SHIFT][ ( ][=]
[7][5][
][2][5][0]
[SHIFT][ ( ][=]
[ ( ][1][4][1][][1][2][0][ ) ]
[][1][2][0][SHIFT] [ ( ][=]
[ ( ][2][4][0][][3][0][0][ ) ]
[][3][0][0][SHIFT] [ ( ][=]
3.9
41.63
45.6
30
17.5
–20
(Linear format) CalculationExample Operation Result
To express 2.258 degrees
in deg/min/sec.
To perform the calculation:
12
º
34'56"3.45
[2][
•
][2][5][8][=]
[º' "]
[º' "]
[1][2][º' "][3][4][º' "][5][6]
[º' "][
][3][
•
][4][5][=]
[º' "]
[º' "]
2.258
2
º
15’28.8”
2.258
43
º
24’31.2”
43.40866667
43
º
24’31.2”
Disp
5
x
6
30
/
5
x
67x8
0
/
7x8
56
2
3
1
2
7
6
1
4
2
3
11
12
2 3+1 2
7 6
314 + 1 2 3
41112
2
3
1
2
7
6
+
Math
9x3
27
4x6
24
2+3
5
||
0
/
412x3 58-71
7 6496
41 2x3 58+6 4
21 1496
41 2x3 58+6 4||
0
/
41 2x3 58||
0
/
123 A
123
AxB
6898824
123x456 B
56088
/
5xA||
A?
0
/
5xA
35
A?
7
5xA
45
Y=AX
2
+6X-9
0
/
Y?
0
/
A?
0
/
Solve for X
0
/
Y=AX
2
+6X-9
X= 1.098076211
L-R=0
/
//
(Linear format) CalculationExample Operation Result
23 + 4.5 –53 =–25.5
56
(–12)(–2.5)
=268.8
(4.5
10
75
)(–2.3
10
–79
) = –1.03510
–3
(110
5
)7=
14285.71429
2
3 ( 4 5 ) = 29
( 7
2 ) ( 8 5 )
= 65
[2][3][
][4][
.
][5]
[][5][3][=]
[5][6][
][(–)][1][2]
[][(–)][2][
.
][5][=]
[4][
.
][5][x10
x
][7][5] []
[(–)][2][
.
][3][x10
x
]
[(–)][7][9][=]
[1][x10
x
][5][][7][=]
[2][
][3][][(][4][][5][=]
Closed parentheses
occurring immediately
before operation of the
[=] key may be omitted.
[( ][7][][2][ )][( ][8][][5][=]
A multiplication sign [
]
occurring immediately
before an open parantheses
can be omitted.
–25.5
268.8
–1.035x
10
–3
14285.71429
29
65
258+456
714
987-Ans
273
(Linear format) CalculationExample Operation Result
sin 63
º
52'41"
= 0.897859012
cos (π/3 rad) = 0.5
tan (–35 grad)
= –0.6128007881
2sin45
º
cos65
º
= 0.5976724775
sin
–1
0.5 = 30
cos
–1
(√2/2)
= 0.7853981634 rad
tan
–1
0.741
= 36.53844577
º
= 36
º
32' 18.4"
2.5
(
sin
–1
0.8cos
–1
0.9)
= 68
º
13'13.53"
Angle unit: Deg
[sin] [6] [3] [
º
' "] [5] [2]
[
º
' "] [4] [1] [
º
' "][ ) ] [=]
Angle unit: Rad
[cos] [
SHIFT
] [x10
x
] [] [3]
[ ) ] [=]
Angle unit: Gra
[tan] [(–)] 35 [=]
Angle unit: Deg
[2] [sin] [4] [5] [ ) ]
[cos] [6] [5] [ ) ] [=]
Angle unit: Deg
[
SHIFT
][sin] [.] [5] [ ) ] [=]
Angle unit: Rad
[
SHIFT
] [cos][ [√
---
] [2] [ ) ]
[] [2] [ ) ] [=]
Angle unit: Deg
[
SHIFT
] [tan] [.] [7] [4] [1]
[ ) ] [=]
[º ' "]
Angle unit: Deg
[2] [.] [5] [
] [(] [
SHIFT
]
[sin] [.] [8] [ ) ] [] [
SHIFT
]
[cos] [.] [9] [)] [ ) ] [=]
[º ' "]
0.897859012
0.5
–0.6128007881
0.5976724775
30
0.7853981634
36.53844577
36
º
32’18.4”
68.22042398
68
º
13’13.53”
1 :sinh2 : cosh
3 : tanh4 : sinh
-1
5 : cosh
-1
6 : tanh
-1
2-lines display
Dual Power Scientific Calculator with
Natural Textbook Display
Please read before using.
DS-991ES
Bekijk hier gratis de handleiding van de Datexx DS-991ES. Deze handleiding valt onder de categorie rekenmachines en is door 1 mensen gewaardeerd met een gemiddelde van een 7.5. Deze handleiding is beschikbaar in de volgende talen: Engels.
Heeft u een vraag over de Datexx DS-991ES of heeft u hulp nodig? Stel hier je vraag
Heeft u een vraag over de Datexx en staat het antwoord niet in de handleiding? Stel hier je vraag. Zorg voor een duidelijke en uitgebreide omschrijving van het probleem en je vraag. Hoe beter je probleem en vraag is omschreven, hoe makkelijker het is voor andere Datexx bezitters om je van een goed antwoord te voorzien.
Het antwoord op uw vraag niet in de handleiding kunnen vinden? Wellicht staat het antwoord op uw vraag hieronder in de meest gestelde vragen over de Datexx DS-991ES.
Wat is een Overflow error?
Een Overflow error komt meestal voor als de uitkomst van de som langer is dan de rekenmachine kan tonen.
Een batterij in mijn rekenmachine is gaan oxideren. Is het apparaat nog veilig te gebruiken?
Het product kan nog veilig gebruikt worden na goed reinigen. Verwijder de batterij met handschoenen en maak het batterijcompartiment schoon met een tandenborstel en azijn. Na het drogen kunnen er nieuwe batterijen in het apparaat.
Waar staat AC voor op mijn rekenmachine?
AC staat voor 'all clear'. Je maakt het volledige geheugen van de rekenmachine met deze knop leeg.
Is de handleiding van de Datexx DS-991ES in het Nederlands beschikbaar?
Helaas hebben we de handleiding van de Datexx DS-991ES niet beschikbaar in het Nederlands. Deze handleiding is wel beschikbaar in het Engels.
Hulp nodig?
Heeft u een vraag over de Datexx en staat het antwoord niet in de handleiding? Stel hier je vraag. Zorg voor een duidelijke en uitgebreide omschrijving van het probleem en je vraag. Hoe beter je probleem en vraag is omschreven, hoe makkelijker het is voor andere Datexx bezitters om je van een goed antwoord te voorzien.
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