B A 4 3 2 1 4 3 2 1 c b a !!" !#!$ %&'()* "!+,&'-./ 0 A.1234,5$!-/ 67'89(-:;<=>?'>-+@ A;<#$A B B C 'D<-;7> C -< B E F$ − =!GH !GH I$ − = −!GH !GH A$) − =!GH !GH J$ = −!GH !GH A;< $KL<=MNO ( ) − + 5 # > F$)# I$# A$ J$) A;<5$KL<=MNO ( ) : −H H P Q > F$ −# 5 I$ 5 − A$5 J$)5 A;<Q$KL<=MNO,)H/ Q $,)H/ 5 B RS B R T >< U 7 C > C F$,)H/ # I$,)H/ * A$ H * J$ H # A;<H$ B <' B $RVW$,GWGGRX!/Y C D<7-Z[>4: F$ W R = I$ R W = A$ R W = J$ R W = A;<\$IK]G7>-^>Z[>4_G`((_S:''W=D< a(_b&c> F$QA$ I$"J$ Q # A;<*$A' C D& B 7Vd,]/V] e#$ f - T C 'D<-;7la ̀ sai E F$d,!/V#I$d,#/V A$d,#/V!J$d, /VH A;<P$-gD'D'> F$-g&3<A$-g&< C < I$-g;W4 J$-g&`-< A;<"$A'W-gGWG$K< W ⊥ GWhhi F$W ⊥ I$hh A$hhW J$ ⊥ A;<#!$'ijWG'hhW$K><; T '-+E F$ F k Q e I k V#P! ! A$ ˆ ˆ + = ! # F I #P! I$ 5Q I k F k = J$ 5 I k F k = A;<##$A B B W f < C 'RS B -;7R U - T -< B - T >7 B C Y B ; B ' B ' C < f & T B E F$%& U ' B ' C < f & T B W C & f < f ' B '$ I$%& U ' B ' C < f & T B W C & f < f ' B '& C S B ' B $ A$%& U ' B ' C < f & T B W C & f < f W' B '$ J$%& U ' B ' C < f & T B W C & f < f & T ' B ' C ' B C S B ' B $ A;<# $A'(FIA%1Wl<GWKFIV%GIAV1$m4<DnWl <M(K-+> F$ ∆ FIAV ∆ %1I$ ∆ FIAV ∆ 1%A$ ∆ FIAV ∆ 1%J$ ∆ FIAV ∆ %1 ] P \ 7 # E I$12Won><o,*G!-/ I#, G!-//n4NO : − + ÷ ÷ 5 P 5 H #H Q W/i]'Y f > T B GWK , − = ] * 5 \ I , G!-//5!&;- C '& T 'S B # S C $' f ; C ' B W'<& ;- f - C ']''S-' B 'PS C $,I B C D<; B > C T < f & U &; </ W/p'D B D& B Q! C 5 #P! I5,5G!-$A' ∆ FIA' B J> C <- f < f T FI C q> C <- f < f T FA$ Jq>; B 7- f rD''q> C <- f < f -' T f Jr$A B C / ∆ FqJV ∆ AqrW/FIhhAr/JqV # IA I> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 FE D C B A . . s1s)Itut%0%vws*xAy !!" !#! F$1234,5G!-/ # 5 Q H \ * P " #! ## # F I J I A F A J J A I F %z;<34-+!G H- I$12Won><o,*G!-/ I#, G!-/ /n4NO,#G!-/W/i]GWK , − = ] * 5 \ ,#G!-/ : − + ÷ ÷ 5 P 5 H #H Q . : ,] * 5 \= − ,!GH-/ V " 5 P Q − + ÷ ,!G H-/ ]V#H ,!GH-/ V " " P #\ − + ,!G H-/ V " #\ − ,!GH-/ I , G!-//,#GH-/ a]>D& B &;; C ' B - f - C ']''S'PS C ,!G H-/ {iDc&;>'&4>-^>Z[>4_,!G H-/ `5!$# V]$P,!GH-/D<7]V 30.12 45 8 = ,!G H-/ {o7; C ' B QH&;- f - C ']''S'PS C ,!G H-/ W/p'D B D& B Q! C 5 #P! ,!GH-/ Q! V Q$\! V, Q / \! V#\ \! 5 #P! V5 5$\! V,5 5 / \! V * \! ,!G H-/ % C #\| *D<7 Q! |5 #P! ,!G H-/ I5,5G!-/ij}}';<G;<W,!GH-/ /A B ∆ FqJV ∆ Aqr,#G!-/ ~? B B ∆ FqJG ∆ Aqr' B FqVqA,R'q> C <- f < f FA/,!G H-/ JqVqr,R'q> C <- f < f Jr/,!G H-/ C ˆ ˆ # q q= ,' B -& B -Y f /,!G H-/ D<7 ∆ FqJV ∆ Aqr,$$/,!G H-/ W/A B FIhhAr,!G*H-/ ?';<G' B ∆ FqJV ∆ Aqr,!G H-/ D<7 ˆ ˆ F FAr= ,!G H-/ C < B S f T ' B D'>?'V•FIhhAr,!G H-/ A;</A B JqV # IA,!G*H-/A B JIVAr,!G H-/ B B JIrGArIW C <,!G H-/G& C >; T ><; T JqV # IA,!G H-/ Chu ́ y ́ : Ca ́ c ba ̀ i toa ́ n trong đề thi co ̀ n co ́ ca ́ c ca ́ ch gia ̉ i kha ́ c, nếu gia ̉ i đu ́ ng vâ ̃ n đa ̣ t điểm tối đa. . D'>?'V•FIhhAr,!G H -/ A;</A B JqV # IA,!G*H -/ A B JIVAr,!G H -/ B B JIrGArIW C. <,!G H -/ G& C >; T ><; T JqV # IA,!G H -/ Chu ́ y ́ : Ca ́ c ba ̀ i toa ́ n trong đề thi co ̀ n co ́ ca ́ c ca ́ ch gia ̉ i kha