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a fost răspuns

daca 3a+2b+2c=0,45 si a+2b+2c=0,99 , aflati a+b+c

Răspuns :

3a+2b+2c=0,45
a+2b+2c=0,99
-------------------- +
4a+4b+4c=1,44
4(a+b+c)=1,44
a+b+c=0,36

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