HP 17BIIPLUS Manuel utilisateur
hp calculators
HP 17bII+ Chain Calculations
Algebraic Mode
Reverse Polish Notation Mode
hp calculators
HP 17bII+ Chain Calculations
Chain calculations, also called series calculations, are those calculations where you are performing successive arithmetic operations
in a “chain” or “series.” Your financial calculator can efficiently perform these operations in either the Algebraic or Reverse Polish
Notation mode.
ALGEBRAIC:
The Algebraic system uses parentheses the way you would write out an arithmetic operation. For example, say you wanted to
multiply the sum of 10 and 20 by 5. You would write this: 5(10 + 20). Below are the keystrokes for this operation and also what your
display (set to two places to the right of the decimal) will show as you perform each step:
Keystrokes Display
5 5
x 5.00x
( 5.00x(
10 5.00x(10
+ 5.00x(10.00+
20 5.00x(10.00+20
) 5.00x30.00
= 150.00
At the point when you have closed the parentheses the calculator performs the arithmetic operation inside the parentheses. Instead
of closing the parentheses, you have the option of just hitting the equal sign and that will both perform the operation inside the
parentheses (10 + 20) and outside (5x).
REVERSE POLISH NOTATION:
In the RPN mode we will work the problem we did above using the Algebraic system, the 5(10+20). It is generally easier (less
keystrokes) when using the RPN mode for solving a problem of this type to work inside the parentheses first. That is, we will add the
‘10’ and ‘20’ before we multiply by the ‘5.’ The keystrokes and the display (set two places to the right of the decimal) on each step
are:
Keystrokes Display
10 10
ENTER 10.00
20 20
+ 30.00
5 5
x 150.00
The ability to perform chain calculations is an immense advantage in the use of the HP 17bll+. Let’s try the slightly more involved
problem shown below, to ensure you feel comfortable in working these calculations:
18 + 12(240 - 3)
75
ALGEBRAIC:
Keystrokes Display
18 18
+ 18.00+
( 18.00+(
hp calculators - 2 - HP 17bII+ Chain Calculations
hp calculators
HP 17bII+ Chain Calculations
The open parentheses is inserted here because ‘18’ is going to be added to the result of the rest of the arithmetic operation in the
numerator. That is, before we can add ‘18’ we have to get the result of ‘12’ times the result of ‘240’ minus ‘3.’
12 18.00+(12
x 18.00+(12.00x
( 18.00+(12.00x(
The additional open parentheses is necessary here because you have to calculate what is inside the parentheses of the problem -
the ‘240’ minus ‘3’ - before you multiply by the ‘12.’
240 18.00+(12.00x(240
- 18.00+(12.00x(240.00-
3 ... .00(12.00x(240.00-3
) 18.00+(12.00x237.00
The closing of the second open parentheses (the one to the right) calculates what is inside of that parentheses, ‘237,’ the result of
subtracting ‘3’ from ‘240.’
) 18.00+2,844.00
The closing of the first open parentheses (the one to the left) calculates the result of ‘12’ times ‘237.’
÷ 2,862.00÷
Hitting an arithmetic operator, in this case the division key, completed the pending addition in the numerator and indicated the result
in the display before showing the division sign.
75 2,862.00÷75
= 38.16
Note that if you started the above problem by working inside of the parentheses you could solve the problem with less keystrokes:
Keystrokes Display
240 240
- 240.00-
3 240.00-3
x 237.00x
As shown in the previous calculation, when an arithmetic operation is pending and not shielded by parentheses, the calculator will
complete that pending operation if you key in a subsequent arithmetic operator. So, in the above we had “240 - 3” pending when we
keyed in the subsequent “x,” which caused the calculator to perform the subtraction as the “x” was brought in.
12 237.00x12
+ 2,844.00+
18 2,844.00+18
÷ 2,862.00÷
75 2,862.00÷75
= 38.16
hp calculators - 3 - HP 17bII+ Chain Calculations
hp calculators
HP 17bII+ Chain Calculations
REVERSE POLISH NOTATION:
As was demonstrated in the Algebraic mode, it is usually easier (less keystrokes) in working a problem like this to begin with the
arithmetic operations inside the parentheses first. We do that in the keystrokes shown below to solve this problem:
Keystrokes Display
240 240
ENTER 240.00
3 3
- 237.00
12 12
x 2,844.00
18 18
+ 2,862.00
75 75
÷ 38.16
hp calculators - 4 - HP 17bII+ Chain Calculations
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