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Verified answer
∆t = 80-20 = 60°CLo = 2m
@ = 0,000012 = 12 x 10^-6/°C
∆L = 2 x 12 x 10^-6 x 60 = 1.440 x 10^-6
∆L = 1,44 x 10^-3 m = 0,00144 m
L¹ = 2 + 0,00144 = 2,00144 m