de KT HKI lop 10 09-10

   !"# $%&&'  ()*+,- ./012.3 4 3-,- 5678 9: ;":%< ;=> 9: ?,@3ABC ?-@DAB;=>C ∪ = −∞A B ( ; 2009) ∩ =A B [12; 25) =A \ B [25; 2009) ?-@AB;=>C ∀ ∈ + − ≥¡ 2 A :" x :x x 2 0" -@3A -@3A -@3A -@A 9: ?,@DABC ?-@DAB;=>C  ! "  # $ % # & + = −   + =  '()*+,#*-% ?-@AB;=>C ./'01'2  $?-@AB;=>C - 34*5+65 ≥ &789:';9'<=7 - 34*-5+65 < &789:';9'<=7 -@3AE3 -@3A -@A -@3A -@3A 9: ?3@-BC ,F?-@DAB;=>C >+?" ( )   % 5  − = − 7 @ ! )A =BC5 ∈¡ D   % &   &  − =  − =   ! '()* 3F?,@3AB;=>C 34 ! 9  D9 "  5  ≤  =)E !    5  < ≤  =)E !    5 $< ≤  =)E !  5F$ =)E ! 7 GHI "I =8 -@3A -@3A -@3A -@3A -@3A -@3A -@3A -@3A  9: ?3@-BC ,C?-@AB;=>C !='()9:';'<=JK&L%M !='()9:';'<=K$L%M 3C?-@DAB;=>C N ';O,): P*$ N ';O,): P*Q N )+*KPRPM*S GC?-@DAB;=>C N )?)9PJ*%  N)! #! , "8*PJ7P*  -@3A -@3A -@3A -@3A -@3A -@3A -@A 567HI 9:J ?3@-BC ,F?,@-B;=>C  T T TJ KTP PM KTP PM KTP PJM+ + = + + + + + uuuur uuur uuur uuuur uuur uuuur uuur uuuur uuur  T T TJ $TP KP P PJM+ + = + + + uuuur uuur uuur uuuur uuur uuur uuur  T T TJ $TP+ + = uuuur uuur uuur uuuur K+!PH,U V==W)JM 3F?,@-B;=>C N #W DN 'X Y  9:=W)J#Z  a 3 3 7 )A" T T TJ+ + uuuur uuur uuur *$7 MO uuuur *$7 a 3 3 * a 3 -@3A -@3A -@A -@A -@3A -@3A 9:J ?,@-BC ,F?-@AB;=>C @ ! )A =D+,)[D ' 0∆ ≥ K= 1 ≠ ± M  2 4m 4m 1 0− + ≥ K= 1≠ ± M  ( ) 2 2m 1 0⇔ − ≥ +6=U= 1≠ ± .I"= 1 ≠ ± ! ! H\ )A = 3F?-@AB;=>C )A" ! )A =5* ]  2 m 2m 8 0+ − =  ! '()=*K I M^=*-%KH9:M .6=*! =)Y H:5*- -@3A -@3A -@3A -@3A  9:K ?3@-BC ,F?,@-B;=>C )A" p r +, q r )_   ] 0 :`a)=9)9 p mq= r r 7  ⇔  2a b+ r r *=K a xb+ r r M (2 m)a (1 mx)b 0⇔ − + − = r r r .!+b) a r +, b r DW) 0 r +,D\ )_   ] " 2 m 0 1 mx 0  − =  − =  '()5* 1 2 7 3F?,@-B;=>C Jc = '()"  T T TJ $TP+ + = uuuur uuur uuur uuuur K+!PH,U V==W)JM N #W DN 'X Y  9:=W)J#Z  a 3 3 7 )A" T T TJ+ + uuuur uuur uuur *$7 MO uuuur *$7 a 3 3 * a 3 -@3A -@3A -@3A -@3A -@3A -@3A -@3A -@3A 9:K ?,@-BC .6= 1≠ ± )A" ' ∆ * 2 4m 4m 1 0− + ≥  ( ) 2 ' 2m 1 0⇔ ∆ = − ≥ +6=U= 1 ≠ ±     .I"     !   H\  )A    =  V  # − = = − + 1 2 1 3 x ; x m 1 m 1 +6=U= 1 ≠ ±  .6  = *   !     !   d  ,   -5  e  $  *  & 5* 3 2 − 7  .6 = *  - !    !  d  ,  -S5 e  $ * & 5* 1 2 − 7 -@3A -@3A -@3A -@3A fTU)W)DW) '2 N '()d U '<=`)E)V7 $ . "8*PJ7P*  -@3A -@3A -@3A -@3A -@3A -@3A -@A 567HI 9:J ?3@-BC ,F?,@-B;=>C  T T TJ KTP PM KTP PM KTP PJM+ + = + + + + + uuuur uuur uuur uuuur uuur uuuur uuur uuuur uuur  T T TJ $TP