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Ahora
x₊y=10
Lo elebamos al cuadrado
(x₊y)²=10²
x²₊2xy₊y²=100
(x²₊y²)₊2xy=100
(82)₊2xy=100
2xy=100-82
2xy=18
xy=18/2
xy=9
Rpta: xy=9