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T0 = 12 C
L0 = 72 CM
T = 87 C
L = 72,06 CM
DIT : α ?
dijwb :
α = ΔL / L0xΔT
= (72,06- 72) / 72 x (87-12)
= 0,06 / (72x75)
= 0,06 / 5.400
= 0,0000111 /C