Texas Instruments TI Programmable 57 User Manual

nT
ee
SECTION
1:
BASIC
KEYS
AND
FUNCTIONS
EE
eee
CC)
(1
J-
Pasentneses
Keys
Ina
variety
of
problems
you
may
need
to
specify
the
exact
order
in
which
expressions
are
evaluated,
or
the
way
in
which
numbers
are
grouped,
as
a
problem
is
solved.
Parentheses
give
you
a
way
to
“cluster”
numbers
and
operations.
By
putting
a
series
of
numbers
and
operations
in
parentheses
you
tell
the
calculator:
“Evaluate
this
little
problem
first
—
down
to
a
single
number
result,
then
use
this
result
for
the
rest
of
the
calculation.”
Within
each
set
of
parentheses
your
calculator
will
operate
according
to
the
rules
of
algebraic
hierarchy.
You
should
use
parentheses
if
you
have
any
doubts
in
your
mind
about
how
the
calculator
will
handle
an
expression.
There
is
a
limit
to
the
number
of
parentheses
that
can
be
opened
at
one
time,
and
how
many
“pending”
operations
can
be
handled.
Your
calculator
allows
you
to
open
nine
parentheses
at
one
time,
with
up
to
four
operations
pending
—
exceeding
these
limits
results
in
a
flashing
display.
(You'll
rarely
encounter
this
as
a
problem.)
Note
an
important
point
when
using
parentheses.
You
may
often
see
equations
or
expressions
written
with
parentheses
to
indicate
implied
multiplication:
(2+1)
(8+2)=
15.
Your
calculator
will
not
recognize
implied
multiplications.
You
must
key
in
the
operation
between
the
parentheses:
Cem
mbw34)201
Es.
Here's
an
example
on
using
parentheses:
(8
x
4)
+
(9
x
—
19)
_
(8+10+7)
x
2
Solution:
In
problems
of
this
type
—
you
want
the
calculator
to
evaluate
the
entire
numerator,
then
divide
by
the
entire
denominator.
You
can
be
sure
of
this
taking
place
by
placing
an
extra
set
of
parentheses
around
the
numerator
and
denominator
as
you
key
the
problem
in.
Evaluate
Press
DispLay/COMMENTS
lomso404
92.
(8x4)
displayed
cosGa19e4
OI
OO
-—199.
The
value
of
the
numerator
(O03
G@I10G)7
060205
8.8571429
Value
of
denominator
3)
—15.693548
The
final
result.
2-6

Texas Instruments TI Programmable 57 Specifications

General

Brand	Texas Instruments
Model	TI Programmable 57
Category	Calculator
Language	English