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Perímetro del rectángulo = 2(Base) + 2(Altura)
26 = 2(x + 3) + 2(x)
26 = 2x + 6 + 2x
26 = 4x + 6
26 - 6 = 4x
20 = 4x
20 ÷ 4 = x
5 = x
REMPLAZAMOS:
Altura = x = 5 cm
Base = x + 3 = 5 + 3 = 8 cm
RESPUESTA:
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La base del rectángulo es de 8 cm y la altura es de 5 cm
Espero que te ayude.
Saludos!!