... tTTTTtSdPSdtdtStSdSPStStQ )( ) ( )( ) ( )( ) ( )( ) ( )( ) ( 1111++tTTtSdSPStS )( ) ( )( ) ( )( 11.Từ ) , () ( )( 11tAtStS= ) , () ( )( 11tStAtSTTT=ta có )( ) ( )( ) ( )( tAtQtQtAtQT= )( ) ( )( ) ( )( 11tSdSPSdtdtStTT+.Do ... 222 )( ) ( )( txtQtATi = =+ririiTiihtxtxtQtAhtx1 12 )( ) , () ( )( 2 )( =riTitxtQtA1222 )( ) ( )( 2 )( tQ=riittxtA1220 )( ) (sup (2 .1 0) Mặt khác, từ ,, )( ) ( ssLsGsGiii ... ) =+++riiThtxtxtxtxtAtQtAtAtQ122 )( ) ( )( ) , () ( )( ) ( )( ) ( ( ) =++qikstxtxsdi1220 )( ) ( +=riiihtxtAtxtQ1 )( ) () , () (2 29 tài liệu tham khảo 39Mở đầuTrong thực...