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Calculati.....



5(a+c)+2b, daca a+2b=44si7a+6b+5c=200


Răspuns :

a+2b=44    inmultim cu -2
-2a-4b=-88
7a+6b+5c=200
adunam cele 2 relatii
5a+2b+5c=-88+200=112

5(a+c)+2b=5a+5c+2b
=5a+2b+5c=112