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Verified answer
Lo = 100cm²∆T = 120 - 20 = 100℃
c = 1,2 x 10^-5
∆L = Lo x c x ∆T
∆L = 100 . 1,2 x 10^-5 . 100
∆L = 1,2 x 10^-1 = 0,12cm
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