Răspuns :
a
b=2a+13
c=2b+13
a+2a+13+2(2a+13)+13=346
3a+13+4a+26+13=346
7a+52=346
7a=294
a=42
b=2x42+13=97
c=2x97+13=207
proba : 42+97+207=346
b=2a+13
c=2b+13
a+2a+13+2(2a+13)+13=346
3a+13+4a+26+13=346
7a+52=346
7a=294
a=42
b=2x42+13=97
c=2x97+13=207
proba : 42+97+207=346
In conformitate cu textul problemei , avem :
nr. I. = a
nr. II. = 2*a+13
nr.III. = 2*(2*a+13)+13
=> I+II+III = 346
adica: a + 2a+13 + 4a+26+13 = 346
a + 2a +4a = 346-(13+26+13)
7a = 294
a = 42
Raspuns: nr. I. = 42 ; nr.II. = 2*42+13 = 97 si nr.III. = 2*97+13 = 207.
Verificare: 42+97+207=346 (A)
nr. I. = a
nr. II. = 2*a+13
nr.III. = 2*(2*a+13)+13
=> I+II+III = 346
adica: a + 2a+13 + 4a+26+13 = 346
a + 2a +4a = 346-(13+26+13)
7a = 294
a = 42
Raspuns: nr. I. = 42 ; nr.II. = 2*42+13 = 97 si nr.III. = 2*97+13 = 207.
Verificare: 42+97+207=346 (A)