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granniejo
13.04.2020 •
Mathematics
Mara si familia ei au economisit bani pentru cumparaturi.Cu o treime din suma au cumparat o tricicleta, cu o treime din rest in sevalet iar cu 400 o bicicleta. Cit a cotat fiecare obiect?
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Ответ:
1200
Step-by-step explanation:
Faceti o ecuatie pentru a o rezolva mai usor:
Intrebarea spune ca o treime a fost pentru un tricicleta si o a treia pentru o bicicleta, deci acestea sunt aceeasi valoare. Y este totalul.
x + x + 400 = y
Exista trei parți ale ecuației și intrebarea spune ca doua treimi sunt utilizari pe bicicleta și tricicleta. Trebuie sa ramana o treime, deci pe a treia (x) trebuie sa fie aceeași cu 400.
Faceți o noua ecuație:
400 + 400 + 400 = ?
Adaugați numerele pentru a obține raspunsul: 1200
Scuze pentru gramatica, nu scriu bine in aceasta limba.
Ответ:
-x + y = 5; -2x + y = 4
-x + y = 5 -> y = x + 5
-2x + y = 4 -> y = 2x + 4