Question

$\frac{xy}{2x + 2y} = 3$
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Answer 1

xy/(2x+2y) = 3

xy = 3×(2x+2y)

10x+y = 6x + 6y

10x - 6x = 6y - y

4x = 5y ==> x = 5 si y = 4

xy = 54

Verificare:

54 / (10+8) = 54/18 = 3