... = + 8+0 1 0+30+92$.*/ 4 1 7 1 "#$,0+92$.*32 1 0+()0+*3,00+:"#$;+3,.+5-3 ()<0 1 "#$<9 * 1 "#$,2;*0;+*-* 1 3;+Bai ... EB:-D)F=>F,)*3.#72$=>!A==>>GA3 (=B:-* 1 2;30>,.,-+*3*=>*+H#3**+I#=#I#H,/;) 1 32 1 ;+**3+3/0+*9 4+J,*20 1 32 1 >=?J 2Cõu 1 5-*K! ! &x m m ... (! 1 Bai 1 MBai 2!"#$#%&"$%' ()*+,-.*/0 1 2*3 x y zAx y z= + ++ + +Bai 3!4 1 5-*) xx+ =Bai 460+5-*). 1 "#$72mx...