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ΔL = 2 . (17.10⁻⁶) . 75
ΔL = 255 . 10⁻⁵
ΔL = 0,00255
L = 2 + 0,00255
L = 2,00255 m
b. ΔL = 2 . (17. 10⁻⁶) . - 25
ΔL = - 85 . 10⁻⁵
ΔL = - 0,00085
L = 2 + (- 0,00085
L = 1,99915