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Daca:ab+ac=52 si b+c=-13,calculati a...Putin ajutor?...

Răspuns :

[tex]ab+ac=52 \\ a(b+c)=52 \\ b+c=-13 \\ -13a=52=\ \textgreater \ a=-4[/tex]
[tex]\displaystyle ab+ac=52 \\ b+c=-13 \\ a=? \\ ab+ac=52 \\ a(b+c)=52 \\ -13a=52 \\ a=- \frac{52}{13} \\ a=-4[/tex]