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Afla pe a . B . C stiind ca :
a.80:a=b
b.b:c=10
c.80:c = 10


Răspuns :

c) c=80:10=8
b) b=8x10=80
a) a=80:80=1
80:a=b
b:c=10
80:c=10⇒c=80:10⇒c=8
b:8=10⇒b=10·8⇒b=80
80:a=80⇒a=80:80⇒a=1