HP 17bII - Order of Calculations.; Parentheses.

12: The Equation Solver 165
File name : English-M02-1-040308(Print).doc Print data : 2004/3/9
++
−×
abc
def
Since a Solver equation appears all on one line, you must group the
numerator and denominator separately by using parentheses, such as

Order of Calculations. Operations occur from left to right but do:
 Exponentiation first. For example,

is interpreted as A
×
B
3
= C. B is raised to the 3rd power and then multiplied by A. To
raise A
× B to the 3rd power, write the equation as

.
 Multiplication and division before addition and subtraction. For
example,

is interpreted as A + ( B/C ) = 12. To divide
the sum of A + B by C, enter the equation as

.
Parentheses. Parentheses override the above rules of priority. When in
doubt, use parentheses. It never hurts to use parentheses─even multiple
parentheses. (Do not use brackets or braces.)
For example, earlier (page 154) we used the equation
Next Forecast＝Old Forecast +
()
++ ×


%% %Old Forecast
100
ABC
,
which was entered into the calculator as

.
×
A
BC
would be entered as

×
+
×
BC
A
DE
could be entered as
