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16 December, 09:43

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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  1. 16 December, 10:02
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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
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