Hilfe...
-
- Beiträge: 143
- Registriert: So Dez 14, 2008 15:56
- Wohnort: Bad Kissingen
- Kontaktdaten:
Hilfe...
.. ich kann nicht mehr rechnen..
In dem Turnier 3197 hat mein Gegner LeoNL bei Zug Nr. 2 (weiß) folgendes gelegt:5+9:3=8
Ich rechne hin und her und komme aber beim besten Willen nicht auf das Eregbnis 8. Wird ja schon stimmen, sonst hätte es ja der kluge PC nicht angenommen. Wer löst mir bitte das mathematische Rätsel??
Danke im voaus an die klugen Köpfe
Christine
In dem Turnier 3197 hat mein Gegner LeoNL bei Zug Nr. 2 (weiß) folgendes gelegt:5+9:3=8
Ich rechne hin und her und komme aber beim besten Willen nicht auf das Eregbnis 8. Wird ja schon stimmen, sonst hätte es ja der kluge PC nicht angenommen. Wer löst mir bitte das mathematische Rätsel??
Danke im voaus an die klugen Köpfe
Christine
-
- Beiträge: 58
- Registriert: So Sep 19, 2010 8:33
- Kontaktdaten:
Re: Hilfe...
Hi, Punkt vor Strich:
5+(9:3)=5+3=8
5+(9:3)=5+3=8
-
- Beiträge: 143
- Registriert: So Dez 14, 2008 15:56
- Wohnort: Bad Kissingen
- Kontaktdaten:
Re: Hilfe...
stimmt.. da war mal was in der Mathestunde... während ich mir die Nägel lackiert habe, die Wimpern getuscht, die bravo gelesen und Dr. Sommer befragt habe..
Christine
Christine
-
- Beiträge: 3
- Registriert: Fr Sep 30, 2022 6:24
- Kontaktdaten:
Re: Hilfe...
Why is 9:2×9=2 not possible?
It should be the same as 9×2:9=2
It should be the same as 9×2:9=2
-
- Vip
- Beiträge: 9
- Registriert: Di Sep 20, 2022 22:44
- Kontaktdaten:
Re: Hilfe...
9:2x9=40.5 not 2.
Not the same as 9x2:9
I guess you mean 2:9x9=2?
Not the same as 9x2:9
I guess you mean 2:9x9=2?
-
- Beiträge: 3
- Registriert: Fr Sep 30, 2022 6:24
- Kontaktdaten:
Re: Hilfe...
Oh haha
- FriedaBirke
- Vip
- Beiträge: 41
- Registriert: Mo Jan 31, 2022 12:35
- Wohnort: NRW
- Kontaktdaten:
Re: Hilfe...
Dr Sommer hat aber nicht über Mathe aufgeklärt Keine Ahnung, um welches Spiel es geht, aber wenn man die Zahlen verdreht passt es doch. Also anstatt 5+9:3=8.... 9:3 + 5 = 8 nach Adam Riese.
Gruß Frieda
- Erna
- Vip
- Beiträge: 40
- Registriert: Sa Sep 10, 2022 2:25
- Kontaktdaten:
Re: Hilfe...
She probably means the old official rule; "x" goes before ":"? But that would give 9:(2x9)= 0.5, also incorrect.charlotteh hat geschrieben: ↑Sa Nov 02, 2024 1:16 9:2x9=40.5 not 2.
Not the same as 9x2:9
I guess you mean 2:9x9=2?
Here they apply it up to date, x and : are 'equal', and + and - are 'equal' But x and : always go before + and -, by the following rule
"Multiplication and division precede addition and subtraction. When two operators have the same precedence, then work from the left to right.".
With the rules here; 9:2x9= 40.5, old school 0.5
With the rules here; 9x2:9=2, old school too 2
With the rules here; 2:9x9=2, old school 0.025
Edit:
BTW, this oldschool rule has been changed around 1992, so everybody who left school (or math) before this date would come to 0.5, and apply old school style. Nobody told us....
-
- Supervip
- Beiträge: 70
- Registriert: Fr Mär 20, 2020 20:16
- Kontaktdaten:
Re: Hilfe...
Just out of personal curiosity:
@erna: for which country do you state the change from right-associated (not sure if that is what you call this convention in English) to left-associated convention? Afaik for at least (parts of) Austria it has always (or at least back until 70s) been left-associated.
However, my latest info is that there is still no official global agreement on this issue and that majorty is using left-associated and all claim that this issue can and should be prevented by using parantheses (which is obviously not helping us here for Summy).
Edit: thanks, answers my questions - unless someone can provide info about a global conventiin. Left/right means if a/b/c means (a/b)/c (=left) or a/(b/c) (=right).
@erna: for which country do you state the change from right-associated (not sure if that is what you call this convention in English) to left-associated convention? Afaik for at least (parts of) Austria it has always (or at least back until 70s) been left-associated.
However, my latest info is that there is still no official global agreement on this issue and that majorty is using left-associated and all claim that this issue can and should be prevented by using parantheses (which is obviously not helping us here for Summy).
Edit: thanks, answers my questions - unless someone can provide info about a global conventiin. Left/right means if a/b/c means (a/b)/c (=left) or a/(b/c) (=right).
Zuletzt geändert von Statler am So Nov 03, 2024 1:56, insgesamt 1-mal geändert.
- Erna
- Vip
- Beiträge: 40
- Registriert: Sa Sep 10, 2022 2:25
- Kontaktdaten:
Re: Hilfe...
@Statler;
I am dutch.
Up to my last exams in 1991 we had to use the rule that multiplying comes before deviding as long as they were in one sentence. After that year I had nothing to do with mathematics anymore, so I am not sure. But it seems the rules have been changed for some reason.
And to be honest, I have no clue what right/left-association means...
I am dutch.
Up to my last exams in 1991 we had to use the rule that multiplying comes before deviding as long as they were in one sentence. After that year I had nothing to do with mathematics anymore, so I am not sure. But it seems the rules have been changed for some reason.
And to be honest, I have no clue what right/left-association means...
- Mathomo
- Admin
- Beiträge: 888
- Registriert: So Apr 13, 2008 10:20
- Wohnort: Nürnberg
- Kontaktdaten:
Re: Hilfe...
9:2*9=2 should work. Internally the computer calculates with decimal values and rounds only at the end.
According to the rules the term is calculated from left to right. But this is irrelevant in this case.
I assume that something else hindered the validity of the term 9:2*9=2.
@msss: Could you please show the context of your term? A screenshot would be nice.
According to the rules the term is calculated from left to right. But this is irrelevant in this case.
I assume that something else hindered the validity of the term 9:2*9=2.
@msss: Could you please show the context of your term? A screenshot would be nice.
Spielen und spielen lassen
-
- Vip
- Beiträge: 9
- Registriert: Di Sep 20, 2022 22:44
- Kontaktdaten:
Re: Hilfe...
9:2*9=2 werkt niet omdat het 40,5 is en niet 2. Want 9:2=4,5 en als je dat vermenigvuldigt met 9 kom je op 40,5.Mathomo hat geschrieben: ↑So Nov 03, 2024 7:58 9:2*9=2 should work. Internally the computer calculates with decimal values and rounds only at the end.
According to the rules the term is calculated from left to right. But this is irrelevant in this case.
I assume that something else hindered the validity of the term 9:2*9=2.
@msss: Could you please show the context of your term? A screenshot would be nice.
2:9*9=2 zou wel moeten werken.
- Mathomo
- Admin
- Beiträge: 888
- Registriert: So Apr 13, 2008 10:20
- Wohnort: Nürnberg
- Kontaktdaten:
-
- Vip
- Beiträge: 9
- Registriert: Di Sep 20, 2022 22:44
- Kontaktdaten:
Wer ist online?
Mitglieder in diesem Forum: 0 Mitglieder und 0 Gäste