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a+b=16
b+c=20
c-a=18
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a=? b=? c=?


Răspuns :

A+b=16 =>,a= 16-b=16-9=7 B+c=20 => c=20-b=20-9=11 C-a=18 A+2b+c=20+16 A+2b+c=36 2b=36-c-a 2b=36-18 2b=18 B=18:2=9