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Daca
3a+2b+4c=399 si b+2c=150 ,calculati a si ab+2ac
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Răspuns :

Alex05ok
b+2c=150  rezulta b=150-2c
3a+2b+4c=3a+2(150-2c)+4c=3a+300=399
3a=99
a=33

ab+2ac=a(b+2c)=33*150

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