ƚ  1_  .   & & MathType-@[Symbol D؟ww wJ f-2 p (ySymbol D؟ww wJ f-2 p)y y   Symbol D؟ww wJ f-2 (ySymbol D؟ww wJ f-2 )y" "zTimes New Roman؟ww wJ f-2 $2y2  2y2 < 2y2 2y2  2  2 @ 2 h 2 2 4 2 2 2 x  2 x  2 x @ 2 s 2 2 |4 2 | 3 2 n 2 n 2 n@ 2  2 2 r;4 2 r 3 2 (2 2 r%4 2 2 2 r 3 Symbol ؟ww wJ f-2 = 2  + 2  + 2 z= 2 C + 2 + 2 x z= 2 N + 2 | + 2 | - 2 nz= 2  + 2 r- 2 r| - 2 dh= 2 + 2 r- 2 d- 2 h+ Times New Roman؟ww wJ f-2  x 2  x 2 G x 2 x 2 R x 2 | x 2 | x 2  x 2 r x 2 r x 2 x 2 r x 2 lx 2 rx & "SystemJ f !-