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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