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A = a + 105, además sabemos que A = L x L
(l + 5)² = l² + 105
l² + 10l + 5² = l² + 105
10l + 25 = 105
l = (105 - 25)/10 = 8
Amejor-Amenor=105
L^2-l^2=105
(l+5)^2-l^2=105
l^2+10l+25-l^2=105
10l+25=105
10l=105-25=80
l=80/10
l=8 cm
L=l+5
L=8+5
L=13