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Sa se gaseasca numerele a si b a caror medie aritmetica este 200 si care sunt invers proportionale cu 8 si respectiv 4,5.
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Jan 23, 2017
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Sa se gaseasca numerele a si b a caror medie aritmetica este 200 si care sunt invers proportionale cu 8 si respectiv 4,5.
Mathematics
middle-school
Marco Frost
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Bonjour, (as you write in roumain)
Soient a et b les 2 nombres
(a+b)/2=200==>a+b=400
8/a=4.5/b==>16b=9a
a+9a/16=400
==> 25a/16=400
==>a=400*16/25
==>a=256
et b= 9*256/16; b=144
Shinra Tensei
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Jan 27, 2017
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