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α = 0,00002/'C
Δt= 70 - 20 = 50'C
Dit : Lt ?
Jwb :
Lt = Lo ( 1 + α x Δt )
= 40 ( 1 + 0,00002 x 50'C )
= 40 ( 1,001)
= 40,04 cm
maaf ya kalau salah