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Gaseste nr a:a-12=b,b-12=5,c-12=d,d-12=21Gaseste nr a

Răspuns :

Icecon2005
a-12=b;  b-12=5;   c-12=d;    d-12=21


d-12=21⇒d=21+12⇒d=33
c-12=d⇒c-12=33⇒c=33+12=45
b-12=5⇒b=5+12=17⇒b=17
a-12=b, a=b+12⇒a=17+12=29

a=29,  b=17,  c=45,    d=33

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