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Verified answer
DELTA T : 300 - 20 = 280LO = 200 CM
alfa= 1,2.10^-5
Lt = L0(1+alfa.delta t)
Lt= 200 (1+1,2.10^-5.280)
Lt= 200(1+336.10^-5)
Lt=200 + 0.672
Lt = 200,672 cm