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StefaniaTha
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1.Daca 3a+ 2b+ 4c=494 si b+ 2c= 157, calculate ab+2ac.
OFER COROANA!!!!

Răspuns :

Icecon2005

Daca 3a+ 2b+ 4c=494 si b+ 2c= 157, calculate ab+2ac.

3a+ 2(b+ 2c)=494 ⇒3a+2×157=494

3a=494-314

3a=180⇒a=60

ab+2ac=a(b+2c)=60×157=9420


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