Display of fractions

Hello. I have the HP 48gII. I have problems with fractions.

1. when I take a NAP, for example the sum of X = 1 to 50 of 1 / X I get the result:

PSI (51) - psi (1)

which clearly does not help me. If I use the NUM key-> I get the reconciliation, but what I want is the EXACT movement result. I must say that I am already in EXACT mode.

2 this manual: http://h20331.www2.hp.com/Hpsub/downloads/48gIIFractions.pdf

tells me to use the Q-> but it is a bit confusing:

For example, I have 29/21. After reconciliation by-> NUM I get:

1.38095238095

After that, I have use-> Q (YEARS (1)) which gives me:

29/21.

Which is the original and true value.

The problem is that sometimes-> Q does not represent the real and true value as just happened with 29/21. So, how can I be sure that-> Q gives me the exact fraction and not an approximate fraction?

Thank you!

HE28 wrote:

Hello. I have the HP 48gII. I have problems with fractions.

1. when I take a NAP, for example the sum of X = 1 to 50 of 1 / X I get the result:

PSI (51) - psi (1)

which clearly does not help me. If I use the NUM key-> I get the reconciliation, but what I want is the EXACT movement result. I must say that I am already in EXACT mode.

....... All I get is the exact fraction that should be:

1195757/360360 (made on computer)

See the following forum post:

https://groups.Google.com/Forum/?fromgroups#! searchIn/comp.sys.HP48/PSI/comp.sys.HP48/NCirSa882xE/rdwfBqdfjdkJ

using the method shown in this post (displayed in the RPL format):

1 / X'

« X »

1

50

1

SEQ

the result is displayed in a list (only the part of the list can be shown due to the size of the screen):

Now perform the following function

ΣLIST

result:

Now perform the following function

EVAL

result:

the number above is an accurate result.

now run-> NUM

result:

4.49920533832

NOW...

PSI (51) - psi (1)

-> NUM

result:

4.49920533833 @notice the difference in the 11th decimal digit

calculation of your computer:

1195757/360360

-> NUM

result:

3.31822

Tags: HP Tablets

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