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=> AP / PB = 1/2
=> ( X - X(1) ) / ( X(2) - X) = ( Y - Y(1) ) / (Y(2) - Y) = r ....(r= razón)
=> A( X(1)=1; Y(1)=2) y B(X(2)=7; Y(2)= 8)
Reemplazando valores en la fórmula tenemos:
=> ( X - 1 ) / ( 7 - X) = 1/2 ......(resolviendo)
=> 2( X - 1) = 1( 7 -X)
=> 2X - 2 = 7 - X
=> 2X + X = 7 + 2
=> 3X = 9
=> X = 9/3
=> X = 3 => RESPUESTA(1º)
=> ( Y - 2 ) / ( 8 - Y) = 1/2
=> 2( Y -2) = 1 ( 8 - Y)
=> 2Y - 4 = 8 - Y
=> 2Y + Y = 8 + 4
=> 3Y = 12
=> Y = 12/3
=> Y = 4=> RESPUESTA(2º)
El punto (interior AB) es ( 3 , 4) => RESPUESTA FINAL
Espero haberte colaborado. Suerte-.