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Media aritmetica a+b=3.6 ,b+c=4.2 a+c=5.4 determinat i a.b si c

Răspuns :

a+b=3.6
b+c=4.2
a+c=5.4
---------------| +
2a+2b+2c= 13.2 | :2
a+b+c=6,6
3,6+c=6,6
c=3

b+3=4.2
b=1,2

a+1,2=3,6
a=2,4