Răspuns:
a+b+c=63
b=2a
c=2b =2•2a =4a
a+2a+4a=63
7a =63
a=9
b=2a =2•9=18
c=4a =4•9=36
verificare :a+b+c=63
9+18+36 =63
27+36=63
63=63 adevărat
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Răspuns:
a+b+c=63
b=2a
c=2b =2•2a =4a
a+2a+4a=63
7a =63
a=9
b=2a =2•9=18
c=4a =4•9=36
verificare :a+b+c=63
9+18+36 =63
27+36=63
63=63 adevărat