300
今日(12) =2/(12 +1) ×今日收盘价+ 11/(12+1) ×昨日(12)= 2/13 × 15560 + 11/13 × 16320 = 16203;今日 (26) =2/(26 +1) × 今日收盘价+25/ (26 +1) × 昨日 (26) = 2/27 × 15560 + 25/27 × 15930 = 15903; = (12) - (26) = 16203 -15903 = 300