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   M x f x C∈ = !"#$%  4 4 4 Y    y f x x x f x= − + F'   4 4 4      4x x y x x+ − − + − = c c#*+,- &'c.#   4 7 4       x x − ⇔ = + −  #!T#5 4 4x =  4 x = c &'g%6  4x y+ − =  U 4x y+ − = 4/U 4/U 4/U 4/U / c@h !"#$%L!"#!"#C   3  4   2 4 2 c x x c x π − + + + =    U   3 4 3 2 c x c x π π ⇔ + + + + =       U    4 2 2 c x c x π π ⇔ + + + + = 0!T    2  c x π + = −     2 c x π + = − <B c0    2  c x π + = − !T#5   x k π π = +  U  2 x k π π = − + 4/U 4/U 4/U 4/U / c@h5!"#!"#C   3 3        x xy x y x y x xy  − = −   − − = −   cfDi j  3 x xy u x y v  − =   =   (!T5    u v v u  = −  − = −  c05$!T#5&-<-4X-X3 c8*=#!T#5R-'<-4X-4 4/U 4/U 4/U 4/U 3 cfD;R 89J;XRJR(hdR;4%;( 7 x π = %   t = 8*=         < <t t I dt dt t t = − = ∫ ∫ cfD   < -u t dv dt t = =    -du dt v t t ⇒ = = − >&'$           < <       I t dt t t t = − + = − − ∫ ck&    <   I = − −  4/U 4/U 4/U 4/U 7 c% c0OF<$&#+@(N#  SH ABC⊥ clm##=#ID G#>?@(>?CD'<  4 24SEH SFH= = cn HK SB⊥ (<d <&d&'$#=#ID G#>?@>@ .# HKA / cod <&d9!T?;?@;(   a HA = ( 4 3  24  a SH HF= = c8#>F&A#BF=       3 4 KH a HK HS HB = + ⇒ = c8#?F&A#BF=  4   3 3 4 a AH AK H KH a = = =  3  3 AKH⇒ =  4/U 4/U 4/U 4/U U c@h       a b c c ab c ab b a a b + − − = = + + − − − − 4/U c8*=             c b a VT a b c a c b − − − = + + − − − − − − p((J!"#MM;((&P)#4-;qX(X(X J!"# c Jj#]G#NAJ!"#!T 3    3/ / /          c b a VT a b c a c b − − − ≥ − − − − − − ;3  fG#NR'$)E)  3 a b c= = = 4/U 4/U 4/U 2/ c ∆ = !"#$%  3   x t y t = −   = − +  =   3-u = − ur c?&P ∆   3 -   A t t⇒ − − +  c8=?@- ∆ ;7U 4    -   c AB u⇔ = uuuur ur  /   / AB u AB u ⇔ = uuuur ur ur   U 3 2b U2 7U 4 3 3 t t t t⇔ − − = ⇔ = ∨ = − c+g%<   3 7  3  - (  -  3 3 3 3 A A− − 4/U 4/U 4/U 4/U 1/ cJk&  4- -4M − =   - - 3u = − − uur JZk&  4--7M =   --Uu = uur c8=   -  7- r-7u u O   = − − ≠   uur uur ur (   4--7M M = uuuuuuur ls     - / 2 7 4u u M M   = − + =   uur uur uuuuuuur  JJZ# G#/ c0O^<D G#NJJZ;q^=  -- n = − ur  k&W  = !"#$%   4x y z+ − + = cpt]'+W-X-&Pu^(*==  4/U 4/U 4/U 4/U r/ cfv&)56Rq4 c8F6RsR;<#5 c8F6Rs x ≠ (h !"#$%!"#!"#C      <# 7   <# 7  <# 7  x x x x x x + = + + + + + fD <#   x x t+ = (!T !"#$%       t t t + = + + #!T;;Xw3 cC; <#    x x⇒ + =  !"#$%'A#5 cC;Xw3  <#   3 x x⇒ + = −    3 /7  x x⇔ + = c xd]'  r x = <#5c x&  r x > %8cq 4/U 4/U 4/U 4/U x&  r x < %8cy(d'c=#5J&']  r x = c<&d6#5 !"#$%L<R;  r x = 2/ c=:Q4-4()9a; cJ\B+ :5  -  d O d⇔ < c8=    / / /    OAB S OAOB AOB AOB= = ≤ 8*=J59#?Q@<C])E) 4 b4AOB =    -   d I d⇔ =  m ⇔ = ± 4/U 4/U 4/U 4/U 1/ c  ∆ = !"#$%    3 x t y t z t = −   = − +   =  c  ∆ = !"#$%  U 3 x s y s z s = +   = +   =  c0z   -d A d B∩ ∆ = ∩ ∆ =   -  -3 @M-UM3-A t t t⇒ − − + c   -3 2- 3 AB s t s t s t= + − + − uuuur (ua=  -- 3n = − ur c   {d R AB n⊥ ⇔ uuuur ur H# !"#   3 2 3   3 s t s t s t+ − + − ⇔ = = −  3 7 t⇒ = cJk&   3  - -    r A =  -- 3n = − ur ;qJ= !"#$% 3   r     3 z x y − − − = = − 4/U 4/U 4/U 4/U r/ cfv&)56 3 4 <# b 1 4 b 1 4 x x x >   − >   − >  #!T b <# 13x > % b <# 13x > q L!"#!"#C  3 <# b 1 x x− ≤  b 1 3 x x ⇔ − ≤  3 r 3 b x x  ≥ −  ⇔  ≤    x ⇔ ≤ c<&dd #56 b <# 1-|T = 4/U 4/U 4/U 4/U o!&}6x&9<)m#%#)]~!C<=/ . !"#$%&& ''''''''''''''''#()*+!, /)0123Thi gian lm bi: 180 pht, không k thi gian. 7  3  - (  -  3 3 3 3 A A− − 4/U 4/U 4/U 4/U 1/ cJk&   4- -4 M − =    - - 3u = − − uur JZk&   4- -7 M =    - -Uu = uur c8= . +   =  c0z   -d A d B∩ ∆ = ∩ ∆ =   -  -3 @M-UM3 - A t t t⇒ − − + c   -3 2- 3 AB s t s t s t= + − + − uuuur (u a =   - - 3n = − ur c   {d R AB n⊥ ⇔ uuuur ur H#

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