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2A+2L=72
A+L=36
A+9+A=36
2A+9=36
A=12,5
L=20,5
Largo: p
Ancho: q
Perímetro: 2p+2q= 72
Simplificando: p+q= 36
Diferencia entre largo y ancho.
p-q=9
Comparamos.
p+q= 36
p- q= 9
Se obtiene.
2p= 45
p= 22.5m. --> Largo.
p-q=9
22.5-q= 9
-q= -13.5
q= 13.5m. --> Ancho.