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Biankbiank
a fost răspuns

Se stie ca a +b = 55 , iar ac+bc= 550
Calculeaza:
A) a+b+c
B) 3a+3b+ 4c

Răspuns :

c(a+b)=550
55c=550
c=550:55
c=10
a+b+c=55+10=65
3a+3b+4c=3(a+b)+4c=>3x55+4x10=165+40=205
Andreeapba
a+b=55
ac+bc=550⇒c(a+b)=550  c=550/a+b  c=550/55  c=10
a+b+c=55+10
 a+b+c=65
 3a+3b+4c=3(a+b)+4c=3*55+4*10=165+40=205