Question

Oblicz wartość liczbową wyrażenia x3+y3, gdy x+y=3 i xy=2

Answer 1

Answer 2

{x+y+3

{xy=2

       {x=y-3

       {(3-y)razy y=2

       {x=3-y

       {-y kwadrat +3y-2=0

       {3-y=2

       {x=2                    {3-y=1

       {y=1                    {x=1

       {x=2                    {x=1

                                 {y=2