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Pitanje iz primjena i problemski zadataka

Istaknuto · Pitanje postavio/la Anđela (Gost)
u Srijeda, Svibanj 01 2013, 10:11 ·

Vanja  je platio 970 kn inpulse za fiksni i mobilni telefon u travnju. U svibnju je račun za fiksni telefon bio veći 14%, a za mobilni 5%. Koliko je Vanja platio impulse fiksnog, a koliko mobilnog telefona u svibnju ako je platio 107 kn više nego u travnju?

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  • Odgovorio Ujak34 u Srijeda, Svibanj 01 2013, 10:24
    Pitanje je odgovoreno prije 2 dana evo C/P mog rješenja

    X -POTROŠNJA FIXNOG ZA TRAVANJ
    Y -POTROŠNJA MOB. ZA TRAVANJ
    pošto kaže : U SVIBNJU je račun za fiksni telefon bio veći 14%,a za mobilni 5%. Slijedi
    X+14%X=X+0.14X=1.14X -POTROŠNJA FIXNOG ZA SVIBANJ
    Y+5%Y=Y+0.05Y=1.05Y -POTROŠNJA MOB. ZA SVIBANJ

    PA IMAMO JENADŽBE

    X+Y=970
    KAKO STOJI svibnju je platio 107 kn više nego u travnju!!
    DRUGA JED. GLASI
    1.14X+1.05Y=970+107

    iz prve jed. dobijemo da je
    X=970-Y
    i
    1.14X+1.05Y=1077
    -----------------------------uvrstimo X u drugu jed. pa dobijemo

    1.14(970-Y)+1.05Y=1077

    sređivanjem dobijemo

    -1.14Y+1.05Y=1077-1.14*970

    odnosno

    -0.09Y=-28.8

    iz čega dobijemo da je

    Y= 320

    Uvrštavanjem dobijemo da je

    X=650

    1.14X=741
    1,05Y=336


    pa možemo odgovoriti Vanja je za svibanj platio 741kn impulse fiksnog, a 336 impulse mobilnog telefona
  • Odgovorio je Jvcccxxcf u Subota, Lipanj 20 2020, 12:29
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