Question

si x-y=2,x^(3)-y^(3)=40.calcula 3xy

Answer 1

Respuesta:

3xy

Explicación paso a paso:

x-y=2

x^(3)-y^(3)=40

Elevando al cubo:

x-y=2

(x-y)^3=2^3

x^3-3x^2y+3xy^2-y^3=8

x^3-3xy(x-y)-y^3=8

x^3-y^3-8=3xy(x-y)

Remplazando:

40-8=3xy*2

32/2=3xy

16=3xy