Missdebrouille
Question de Missdebrouille


Pour les matheux attention aux neurones ça va fumer



Les sept dixieme de la planete Terre sont recouvert d'eau ce qui lui vaut le nom de planete bleue.
Un quart de cette eau est de l'eau douce dont trois centiemes provient des riviere ,trois dixiemes des eaux souterraines et le reste est stocké dans les glacier

Quelle fraction de la planete Terre occupent:
1/les rivieres?
2/les eaux souterraines?
3/et les glaciers?


Il y a
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6 ans
Réponses (5)
Nailil35
Je n'essaie même pas de raisonner pour trouver la solution !!

Il y a
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6 ans

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/web/elleraconte.com/www/question.php on line 1155
SOLEIL13
Alors je t'explique :
70%, c'est l'eau totale
1/4 de 70% = 17,5 C'est l'eau douce

Sur ces 17,5%
1 ) Rivières = 3/100 soit 0,525 %
2 ) Eaux souterraines = 3/10 soit 5,25%
Total de ces 2 sources d'eau douce = 5,775%
3 ) Le reste, c'est à dire les glaciers =
17,5 % - 5,775 % = 11,725%


Volii, voilou, voilà....mais je peux me tromper !

Il y a
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6 ans

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/web/elleraconte.com/www/question.php on line 1155
Claudine670
Ah t'en as de bonnes toi Mimi, tu trouves qu'on a déjà assez chaud comme ça , du moins chez moi, quitte à fumer je préfère aller me fumer une clope , va, et ensuite je boierai un bon coup d'eau !

Il y a
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6 ans

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/web/elleraconte.com/www/question.php on line 1155
Missdebrouille
Reponse de l'auteur de la question :

Impressionnant, la quantité d'eau douce sur la planète bleue
J'aurais proposé 10 fois moins... en tout cas, c'est ce que j'apprends à mes élèves.
Voici le détail :
Par rappport à la totalité de l'eau à la surface de la Terre
et pas de la Terre dans son entier :
- 97,2% est sous forme liquide salée.
- 2,1% pour les glaciers.
- 0,59% pour les eaux souterraines
- 0,02% pour tout ce qui est lacs, rivières, fleuves,...
- Le reste (< 0,01%), c'est l'humidité des sols, de l'air,...
Soit...

Le raisonnement de Landry.87 est correct à première vue (même si pour moi, les résultats sont faux à cause des valeurs de l'énoncé).

Le principe est donc :
- déterminer la fraction en eau douce par rapport à la totalité de l'eau que je note V.
- 3V/100 ce sont les rivières
- 3V/10 ce sont les eaux souterraines
- (1 - (3/10 + 3/100))V sont les glaciers

ça chauffe les neurones

Il y a
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6 ans

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/web/elleraconte.com/www/question.php on line 1155
Veejoolsade
Bon plus rien à dire vu que soleil et toi avez écrit la réponse !!!!!!!!!!!!!!!

Il y a
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Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/web/elleraconte.com/www/inc/function-question-reponse.inc.php on line 15
6 ans

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/web/elleraconte.com/www/question.php on line 1155
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