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Productos cruzados
En una ecuación de la forma
podemos multiplicar ambos lados por bd para obtener la ecuación
ad = bc .
Esto es conocido por muchos nombres: multiplicación cruzada, realizando los productos cruzados, la propiedad de los medios-extremos, o la propiedad del recíproco.
Ejemplo:
Resuelva para x .
Use la propiedad de los medios-extremos para obtener una ecuación más simple.
3(9) = 7( x + 1)
Ahora simplifique y resuelva.
27 = 7 x + 7
7 x = 20
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