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daca a+b=42 si b+2xc=56 calculati 2xa+5xb+6xc

Răspuns :

2xA+5xB+6xC=2x42+3x56=84+168=252
2a+5b+6c= 2a+2b +3(b+2c)=2(a+b)+3(b+2c)=2×42+3×56=84+168=252