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jika :
lo = 20 cm
∆t = 100℃
α =1.8 × 10 pangkat -5/℃
Maka : p akhir
l=lo × α ×∆t
=20×1.8 ×10 pangkat-5 ×100
=36 ×10 pangkat -3
= 0.036
P akhir = 20 + 0.036
= 20.036 cm
semoga menbantu :)