Casio fx-991ES 用户手册
E-68
Functions
Input Range
tanh
x
0
x
9.99999999910
99
tanh–
1
x
0
x
9.99999999910
–1
log
x
/ln
x
0
x
9.99999999910
99
10
x
–9.999999999
10
99
x
99.99999999
e
x
–9.999999999
10
99
x
230.2585092
'
x
0
x
1 10
100
x
2
x
1 10
50
1/
x
x
1 10
100
;
x
G
0
3
'
x
x
1 10
100
x
!
0
x
69 (
x
is an integer)
n
P
r
0
n
110
10
, 0
r
n
(
n
,
r
are integers)
1
{
n
!/(
n
–
r
)!}
110
100
n
C
r
0
n
110
10
, 0
r
n
(
n
,
r
are integers)
1
n
!/
r
!
110
100
or 1
n
!/(
n
–
r
)!
110
100
Pol(
x
,
y
)
x
,
y
9.99999999910
99
x
2
+
y
2
9.99999999910
99
Rec(
r
,
)
0
r
9.99999999910
99
θ: Same as sin
x
a
, b, c
110
100
°’ ”
0
b, c
x
110
100
Decimal
↔ Sexagesimal Conversions
0
°0'0"
x
9999999°59'59"
x
0: –110
100
y
log
x
100
^(
x
y
)
x
0:
y
0
x
0:
y
n
, (
m
,
n
are integers)
However: –1
10
100
y
log
x
100
y
0:
x
G 0, –1
10
100
1/
x
log
y
100
x'
y
y
0:
x
0
y
0:
x
2
n
1, (
m
G 0;
m
,
n
are integers)
However: –1
10
100
1/
x
log
y
100
a b
/c
Total of integer, numerator, and denominator must be 10 digits or
less (including division marks).
less (including division marks).
m
2
n
+1
2
n
+1
m
• Precision is basically the same as that described under “Calculation Range and
Precision”, above.
• ^(
xy
),
x
'
y
,
3
',
x
!,
n
P
r
,
n
C
r
type functions require consecutive internal
calculation, which can cause accumulation of errors that occur with each
calculation.
calculation.
• Error is cumulative and tends to be large in the vicinity of a function’s singular
point and inflection point.