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a+b+c=625
b-a=2
b-c=12
(Prin metoda figurativă!!!!!)


Răspuns :

a=b-2
c=b-12

b-2+b+b-12=625
3b=639
b=213

a=211
c=201
a + b+ c = 625
b-a = 2 => a=b-2
b-c = 12 =>c=b -12
a+b+c =b-2+b-12 = 3b -14 =625 , 3b = 625+14 , 3b=639, b= 639:3=> b= 213
a= b-2 => a=213-2 => a=211
c= b-12 => c= 213-12 =>c= 201