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ΔL = Lo.α.ΔT
= 4. 25.10^-4 (50-30)
= 100 . 10^-4 . 20
= 2000. 10^-4
= 0,2m atau 20cm jika 10^-4
= 0,002 m = 0,2 cm jika 10^-6
dalam soal 25. 10^ kurang jelas