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daca a+b=43,5 si a+c =1,11 atunci calculati 5a +3b+2c

Răspuns :

a+b=43,5|*3
a+c=1,11|*2

3a+3b=130,5
2a+2c=2,22
--------------------(+)⇒
5a+3b+2c=132,72