176 12: The Equation Solver
File name : English-M02-1-040308(Print).doc Print data : 2004/3/9
Press
, then enter the equation:
To do the calculation:
Keys: Display:
Description:
I
Stores, verifies, and
creates menu labels for
the equation.
27500
Stores old salary.
2
Stores rating.
Calculates new salary.
The Summation Function (
∑
)
The
Σ
function does summation calculations in an equation:
counter variable
starting value
ending value
step size
algebraic expression
The
counter variable
takes on a series of values, beginning with the
starting value
, and incrementing according to the
step size
, until it
passes the
ending value
. For each value of the counter, the
algebraic
expression
is evaluated, and the value is added to the previous value.
The
Σ
function returns the final summation.
For example, when the equation:
is solved for
SERIES
, the counter
I
runs from 1 through 6 in steps of one
─
that is, 1, 2, 3, 4, 5, 6. For each value
I
, the expression
is