ƚ@@ \ ] .  @@& & MathType-   R 4Symbolb ؟ww wTf-2 dy2 dy2 dy2 .y2 .y2 .y2 ,-yTimes New Roman؟ww wTf-2 f6y2 c1y2 3y2 2yTimes New Roman؟ww wTf-2 0xy & "SystemTf !-