Reductions fractions.

11282017, 11:31 AM
Post: #1




Reductions fractions.
Hi,
I would like find for example : Reduce this fractions to the same denominator 1/3 and 4/9. I calculate the lcm what it is 9 and I multiplication the 1/3 by 3. This me give 3/9. Then the answer is 3/9 and 4/9. Of course I know to do by hand but Well in the prime I know "comdenom" but this dont' give this answer and we have use arithmetic operator. For example SIMPLIFY (42/12,12/16,36/24) give [7/2 3/4 3/2], is it a command may be I am ignoring it, that give the same for fractions ? cmd(1/3,4/9)>[3/9 4/9] cmd(5/9,7/4,6/11)>[220/396 693/396 216/396] Thank. Gérard. 

11282017, 02:18 PM
Post: #2




RE: Reductions fractions.
I'm not sure if there is such a command, but an alternative is to help with variables in the CAS.
Viga C  TD  FB 

11282017, 02:23 PM
(This post was last modified: 11282017 02:28 PM by DrD.)
Post: #3




RE: Reductions fractions.
With a list of fractions stored in LO:
Here's the equivalent numerators: EXECON("&1/gcd(L0)",L0); Each one times the common divisor: gcd(L0); Dale 

11282017, 03:06 PM
Post: #4




RE: Reductions fractions.
Hi,
Very helpfull ! Thank to you both. Gérard. 

11282017, 03:38 PM
Post: #5




RE: Reductions fractions.
(11282017 02:23 PM)DrD Wrote: Here's the equivalent numerators: Adapted Divisor: EVAL(1/gcd(exact(L0))) Numerator list: EXECON("&1/EVAL(gcd(exact(L0)))",L0) Viga C  TD  FB 

11282017, 03:46 PM
Post: #6




RE: Reductions fractions.
Hi,
Very helpfull ! Thank to you both. But surely I misunderstand with Carlos. Gérard. 

11282017, 03:52 PM
Post: #7




RE: Reductions fractions.
The idea is to use variables that do not have assigned data, it is possible that in your calculator x, xx have a value, you can use other variables. I used those because they are the ones I can type faster.
Viga C  TD  FB 

11282017, 04:12 PM
Post: #8




RE: Reductions fractions.
Thank once again it run with m, mm for example.
Gérard. 

11282017, 04:56 PM
Post: #9




RE: Reductions fractions.
Hi,
I appreciate Carlos and Dale for the elegant formulas and because I best understand some commands. Gérard. 

11282017, 06:13 PM
Post: #10




RE: Reductions fractions.  
11282017, 07:03 PM
Post: #11




RE: Reductions fractions.
Hi,
I see a little thing I no understand, sometime there is decimal instead of integer. I give example in attachement. Even I try mani things it is no change. It is not important you know. Gérard. 

11282017, 07:54 PM
Post: #12




RE: Reductions fractions.
(11282017 06:13 PM)Didier Lachieze Wrote: For the numerator you can simply do: L0/EVAL(gcd(exact(L0))) Or even L0/gcd(exact(L0)) Geocaching Coords Solver, Number of triangles Puzzle 

11282017, 09:47 PM
(This post was last modified: 11282017 10:12 PM by StephenG1CMZ.)
Post: #13




RE: Reductions fractions.
(11282017 07:03 PM)ggauny@live.fr Wrote: Hi, This gets rid of the unwanted real: Code:
Stephen Lewkowicz (G1CMZ) 

11292017, 09:17 AM
(This post was last modified: 11292017 09:21 AM by ggauny@live.fr.)
Post: #14




RE: Reductions fractions.
Hi,
Taking the idea of Chromos for numerators and applying to denominator I obtain for example : LO[1/40 5/24 7/36 12/25]>[1/40 5/24 7/36 12/25] LO/gcd(exact(LO))>[45 375 350 864] //numerators 1/gcd(exact(LO))>1800 //denominator commun This avoid the influence of *EVAL* wich give sometimes undesired decimals. Now I only have to find the good presentation like for example : 45/1800 375/1800 350/1800 864/1800 But this is a new challenge for me ! Thanks to all for help. Gérard. 

11292017, 03:13 PM
(This post was last modified: 11292017 07:18 PM by ggauny@live.fr.)
Post: #15




RE: Reductions fractions.
Hello,
In CAS program I use this little code : Code:
In the CAS terminal we see [n, n1, n2......] the numerators and just below the denominator. Usefull to verify exercises of my greatgrandson wich learn fractions ! EDIT because little little boy is not good american, the right word is greatgrandson ! Gérard. 

11292017, 03:35 PM
Post: #16




RE: Reductions fractions.
In Home program
Code: EXPORT RedFracssh(l) Viga C  TD  FB 

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