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0.12 cm = 0.012 m........... /\L= 2+0.012
/\L = L . α . /\T
2,0012 m = 2 . α . 30celcius
α = 2,0012/60
α = 0,03
yg ditanya= β
β = 2α= 2(0,03) = 0,06
maaf ya kalau salah..