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6/4X + 2x = 80
6/4X+8/4 = 80
14/4X=80
3.5X=80
X=80/3.5
X= 22.8 = 23 de base
3/4X= 17.14 = 17 de ancho todo redondeado........
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entonces 23+23+17+17= 80 Cm.
Perimetro = 80cm
Largo = x
Ancho = 3x/4
Perimetro = 2 * Ancho + 2 * Largo
80 = 2(3x/4) + 2x
80 = 3x/2 + 2x
80 = 3x/2 + 4x/2
80 = (3x + 4x)/2
80 * 2 = 7x
160 = 7x
160/7 = x
22 ,85 = x
Largo = x = 22,85cm
Respuesta.
El ancho mide 22,85cm aproximadamente