ƚ  R ] .   &@ & MathTypeSymbolF ؟ww wu f-2 ":y2 :y2 :y2 L-y2 =y2 -y2 ,+y2  =yTimes New Roman؟ww wu f-2 6y2 3y2 '1y2 L3yTimes New Roman؟ww wu f-2 yy2  xy2 *yy2  xy & "Systemu f !-