Sai so trong thi nghiem thuc hanh

1 2 . n l l l l l n + + + ≈ = max min 2 l l l − ∆ = Sai số l l l+ ∆ l l− ∆ 1 l . l 2 l l l l= ± ∆ 2,5cm 2,50cm 1,230 1,23 1,012 0,0012 1,2.10 3 1200 0,001200 x y y 1 x 1 x y y 1 x 1 x y