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diket: α=0,000011
Δt= 20 derajat C
Lo= 20M
dit: Δl....??
jwb: Lo+(Lo.α.Δt)
20+ (20. 11X 10 pangkat (-6) . 20)
20+ (2X10. 11X 10 pangkat (-6). 2X10)
20+(2.2.11.10 pangkat (-4)
20+(44 X 10 pangkat (-4)
20+0.0044
Δl= 20,0044