Texas Instruments Titanium TI-89, Руководство пользователя

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792 Appendix A: Functions and Instructions
EndLoop
See Loop , page 814.
EndPrgm
See Prgm , page 828.
EndTBar
See ToolBar , page 863.
EndTry
See Try , page 864.
EndWhile
See While , page 866.
entry()
CATALOG
entry()
⇒
expression
entry(
integer
)
⇒
expression
Returns a previous entry-line entry from the
Home screen history area.
integer
, if included, specifies which entry expression
in the history area. The default is 1, the most
recently evaluated entry. Valid range is from 1 to 99
and cannot be an expression.
Note : If the last entry is still highlighted on the Home
screen, pressing
¸
is equivalent to executing
entry(1)
.
On the Home screen:
1+1/x ¸
1
x
+ 1
1+1/entry(1)
¸
2
ì
1
x+1
¸
1
2
ø
(2
ø
x+1)
+ 3/2
¸
5 / 3
ì
1
3 ø (3 ø x+2)
entry(4)
¸
1
x
+ 1
exact()
MATH/Number menu
exact(
expression1
[ ,
tol
] )
⇒
expression
exact(
list1
[ ,
tol
] )
⇒
list
exact(
matrix1
[ ,
tol
] )
⇒
matrix
Uses
Exact
mode arithmetic regardless of the
Exact/Approx
mode setting to return, when
possible, the rational-number equivalent of the
argument.
tol
specifies the tolerance for the conversion; the
default is 0 (zero).
exact(.25)
¸
1/4
exact(.333333) ¸
333333
1000000
exact(.33333,.001) 1/3
exact(3.5x+y) ¸
7
ø
x
2
+ y
exact({.2,.33,4.125})
¸
{
1
à
5
33
100
33
à
8
}