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Nina D.
matematika - zš

Prečo mi v tomto príklade vychádza -60 a nie 60?

Úloha 11
Nie som si istá či to mám dobre ale stále mi vychádza -60 namiesto 60

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Zelmira B.
Zelmira B. Contact
Nina, nemáš správne zostavenú rovnicu. Správne je: 5x - 85 = 3x + 35
5x - 3x = 35 + 85
2x = 120
x = 60
Danail D.
Danail D. Contact
Len na doplnenie, prečo je rovnica nesprávne zostavená. V prvej časti je zadané, že ti chýba 85 centov na kúpu 5 čokolád, čo znamená, že cena 5 čokolád je o 85 centov viac, než máš. Môžeme to zapísať ako:
5x−85
(x je cena tej jednej čokolády)
V druhej časti hovoríš, že keď kúpiš 3 čokolády, ostane ti 35 centov. To znamená, že cena 3 čokolád plus 35 centov sa rovná cene 5 čokolád mínus 85 centov:
5x−85=3x+35
Dúfam, že pomohlo :)
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