   Thời gian: 90 phút(không kể giao đề)    !"#$%&"% '$(()"%#) *"# %+",-. %/"#%0! 1+" 2"# 3".%'$       4 4 5.%'$678"#.9:"# .;<#)$       = = *"# > > ? @>  @>   A@BCD @EFG.%!H-.(0< * HS chọn 1 trong 2 câu hỏi sau: I!  !"#$%  &     I!' ( )* +  , * - ./ + ) (  +  - 0 +  ( 10 + / !"#%0 o 2 = α 3 +  α  β #3* +  β 0. 4 @EAJ.:)",K.,!$L(0< AJM>(0<@5678$  9   : %  +  9 &  & ;: %  − + AJM>(0<@<0=> 9 :9 :   a a a a A a a + − = + − + −  5?'@7'==>AB CDE=> AJ?=(0<@<0 + F<0 + FG;3<GH33F<GI3 <> + F</ ( 5* +  + 0 + F3< , ' , 0J -   + '0 +  J0 - 1 , ' - K , " ( * +  + KF< , " ( * +  + F< , 1 ' ,  , 04 @N1OAPDP @EFG.%!H-.(0< I! LQ!H.K$R%;S%7T"#<..%7T"#KM a b 310'A.M /N.M"3A=)O)P.M.M1Q)RST>R 0ST>92'=: LQ!H.K$$%;$)$$3",+$%;KM U.M/N0  U.M"3A=.M01QST'A92'=: US 2"#.&"%  &  & V     = = = 92'=:      ; H  = = = 92'=: I! L V "%6W X YZ [ .W \ ]/ X 67T V "##; X $$! \ ;%;#: X $S%! V "%;!.9:"#.;<#; X $Y!/"#% + 0 +  0 (  ( * , .0 +  ,  , /.0 + 30 +  ,  , /0 +  US 2"#W +  o 2 = α .1   . = α 3"0 o V2 =+ βα    .0. == αβ 9X0' ( )* +  @Y.M)PUA#: @EAJ.:)",K.,!$L(0< AJM>(0<@5678$%  9   : %  +                   + = = + = + 92':              = + = + = + 92':   9 &  & ;: %  − +  &  & ; & & ;       − + = = − + 92':  V  H  ; ;   = − + = − + = 92': AJM>(0<@<0=> 9 :9 :   a a a a A a a + − = + − + −  Z==>AB 23  2 23  a a a a ≥ − ≠ ≥ ≠ 9': CDE=> 9 :9 :   a a a a A a a + − = + − + −   9 : 9 : [ \[ \   a a a a a a + − = + − + − 92': 9 : 9 : [ \[ \   a a a a a a + − = + − + − 92':   9 :9 :  9 : a a a a = + − = − = − 92': AJ?=(0<@W]?'D'P23'= ^8F<A%F  _<  G;  _H3  GI3  GF<    + F</ ( 9'`)$a0:9'=: W? + F</ (  FG AB AC G I32 ; 3H = 923'=: .1 2 I b ≈ B 923'=:  ,  22  b V2 b ≈−= BC 923'=: K (  + 310 + F</ ( 30 +   ':923V;3 32; 32; ':923    = + =⇒ += AH ACABAH  c1JG3;923'=: Z - c KF< Gc F< * , K -  + F</ ( 0 -  , J923'=: d0'0 + K -  , 1' ,  - .0.0 + F< ,  + F</ ( 0 -  ,  3;923'=: F  < ; I3 H3 J . :9 :   a a a a A a a + − = + − + −   9 : 9 : [ [   a a a a a a + − = + − + − 9 2': 9 : 9 : [ [   a a a a a a + − = + − + − 9 2':.    Th i gian: 90 phút(không kể giao đề)    !"#$%&"% '$(()"%#)