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Mihaelaniculita
a fost răspuns

daca a+b=7 si 2b+c=13 aflati
a) a+3b+c=
b) 3a+5b+c=

Răspuns :

Bia2299
a. a+3b+c=a+b+2b+c=7+13=20
b. 3a+5b+c= 3(a+b)+2b+c=21+13=34
Andreeapba
a+b=7
2b+c=13
a+3b+c=?
a+b+2b+c=7+13
a+3b+c=20
3a+5b+c?⇔3a+3b+2b+c=3(a+b)+2b+c=3*7+13=21+13=34

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