Texas Instruments TI Programmable 57 User Manual

SECTION 1: BASIC
KEYS AND FUNCTIONS
Tue AOS™ Entry Metuop
Mathematics
is
a
science
which
adheres
to
a
variety
of
rules,
One
such
rule
is
that
it
never
permits
two
different
answers
to
the
same
series
of
operations.
Because
of
this
requirement
—
one
solution
for
any
computation
—
mathematicians
have
established
a
set
of
universally
accepted
rules
when
mixed
operations
are
used
in
one
calculation.
For
example,
the
problem:
3+10-2x14+7=?
has
only
one
right
answer!
(Know
what
it
is?
It's
9.)
You
can
key
this
problem
directly,
left
to
right,
into
your
calculator
equipped
with
the
AOS
entry
system
and
you'll
get
the
correct
answer.
The
calculator
sorts
the
operations
you
enter,
applies
them
in
the
correct
order,
and
lets
you
see
what
it's
doing
along
the
way.
Your
calculator’s
AOS
entry
system
is
quite
an
organizer!
It
sorts
and
then
performs
operations
it
receives
from
you
in
the
following
universally
accepted
order:
1)
Special
Single
Variable
function
keys
(
[#4]
(¥]
etc.)
—
act
on
the
displayed
number
immediately
—
as
soon
as
you
push
the
key.
(We'll
talk
more
about
each
of
these
keys
later
in
the
‘tour’
—
but
they
include
all
the
keys
for
the
trig
and
log
functions
and
their
inverses,
as
well
as
square
root,
and
reciprocal
keys.)
2)
Exponential
calculations
B=)
and
[iN]
(or
¥/y)
are
done
next
(we'll
discuss
these
further
in
a following
section).
3)
Multiplications
and
divisions
are
completed
next,
in
order
from
left
to
right,
followed
by
4)
Additions
and
subtractions,
in
order
from
left
to
right.
Finally,
the
equals
key
=)
completes
all
operations.
When
you
were
in
elementary
school
you
may
have
heard
the
memory
aid
“My
Dear
Aunt
Sally’
(MDAS)
applied
to
help
you
remember
the
last
part
of
this
hierarchy:
Multiplications
and
Divisions
first,
in
order
left
to
right
—
then
Additions
and
Subtractions
in
the
same
way.
Ina
calculator
equipped
with
the
AOS
entry
system
—
all
of
this
is
remembered
for
you.
There
are
cases
in
problem-solving
where
you
may
want
to
exactly
specify
the
order
in
which
an
expression
is
evaluated,
or
the
way
in
which
a
problem
is
completed.
In
these
cases
you
can
control
the
order
with
the
parentheses
keys
(C1)
(1discussed
in
the
next
section.
Parentheses
demand
a
special
first
level
of
attention
in
mathematics
—
and
they're
treated
that
way
by
your
calculator.
2-5

Texas Instruments TI Programmable 57 Specifications

General

Brand	Texas Instruments
Model	TI Programmable 57
Category	Calculator
Language	English