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2010-TOÁN-kD-DH-Lời Giải_ngay 9. 7

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  !" #$%&'()*!+,- ./(*!+,-   y x x= − − +  !" #$%&'()$*+ !,$*+*-''./%0'1'    y x= − ./(*!+,- 2$%&'()     3   4x x x x− + − − = 2$%&'() 3 3             x x x x x x x + + + + + − + = + ∈ ¡ ./(*!+,-566$7  3  8 e I x xdx x   = −  ÷   ∫ ./0(*!+,-).$S.ABCD.+ABCD8)*-'9a,9SA = a:)**-''.   !; S (<$1' (ABCD) 8 = H *> 9 AC,  AC AH = . 2?CM 8%0'! !!'SAC@'M8(*'= !SA 6=6A@BCSMBCDa ./0(*!+,-5)'(EF !     3 4y x x x x= − + + − − + + #$12(3*!+,- Th sinh ch đưc lm mt trong hai phn (456789- :;68<=>?@A/B ./0:C(*!+,-  5('<$1'9>GH+,!'IJ.;I3:KL,(78M3:K,7 %0'(N'9$8OK:4P9>;,.>B%&'  5('A-''!9>GH+Q,!<$1'RSHT+TQ−3U4VSH−+TQ− U4#$%&'()<$1'W*-''./RV!A'XG WY' ./0:C(*!+,-5)$@Q" z = Q  8*Z 9:;68<=>?@A.>8C6 ./0:D(*!+,-  5('<$1'9>GH+,=I4:∆8%0'1'[*!G2?M8) **-''. !I(∆#$%&'()%0'1'∆,A'XM (\Y'IM  5('A-''!9>GH+Q,!%0'1'∆  S 3x t y t z t = +   =   =  ∆  S      x y z− − = =  P9>=]*>∆  !A'X]∆  Y' ./0:D(*!+,-2C$%&'()      4  ,  8'   8' 4 x x y x y x y  − + + =  ∈  − − =   ¡ J^O2O_O2`Oa #$%&'()*!+,- ./     y x x C= − − + b, 5PcSdUW:  3  e   : e 4    4 4: y x x y x x x y= − − = ⇔ − + = ⇒ = =   f   4y x= − − < ⇒ 8(W  8 8 x x y y →+∞ →−∞ = = −∞ HK∞ 4 T∞ +eT 4− +  K∞ K∞ M'(A'K∞:4,'(A'4:T∞ +999HU4,+ c U ∩GHSI  :4±  b 5$*+∆*-''.BS    y x= − ⇒ R∆S+U−HT ∆$Hg⇔C!*.'CS   3    4    x x x b x b x x  − − + = − + =   ⇔   = − − = −    #h+∆S+U−HT4 ./ b2$%&'()S     3   4x x x x− + − − =       3   4    3  4       4     4 x x x x x x x x x x x x x x x ⇔ − + + − − = ⇔ − + + − = ⇔ − + − + = ⇔ − + + =      i         x k x x x VN x k k Z π  = + π   =  ⇔ ⇔   π  + = − = + π ∈    b 3 3           x x x x x x+ + + + + − + = + j: ASH≥− 3             4 x x x x+ + − − − − − = ⇔ 3         4 x x x− + + − − = •       4  x x x − = ⇔ − = ⇔ = • 3      x x+ + = 3   x x⇔ = + + 3 k   x x− = + − ⇔          x x x x x − − + + = + +   4       x x x x x • − = ⇒ = • + + = + + #5U       3 3x x x+ + = + + ≥ #RU    x ≤ ⇒ + + R%&'()-'C#h+Sl'CjSHU:HU ./      3   8  8 3 8  e e e I I I x xdx x xdx x dx x x   = − = −  ÷   ∫ ∫ ∫ 1 4 2 4 3 1 42 4 3   8 e I x xdx= ∫ E c< 8 dx u x du x = ⇒ = :   x dv xdx v= ⇒ =            8       e e e x e x e I x xdx     + = − = − =  ÷  ÷     ∫ 56O  Sc<U8H⇒ dx dt x = HU:U4:HUD:U     4 4    t I tdt   = = =  ÷   ∫ #h+    e I − = ./0 5!.       a a SH a   = − =  ÷  ÷        3  3     a a a SC a   = + = =  ÷  ÷   UI #h+∆mI79%0'!9XH*'∆mI 68(*'= !mI 5X]!9*-''./I,]U   mM 5!. 3          3    a a V S ABC a   = =  ÷   lV(MABC) = V(MSBC) =   V(SABC) = 3  k a  ./0   3 n   i   y x x   = − − + − − − +  ÷   :AS     4 3 L  i  i 3 4 4 x x x x x x x  − + + ≥ − ≤ ≤   ⇔ ⇔ − ≤ ≤   − ≤ ≤ − + + ≥        3 3       e    i   i 3 n 3 n      x x x x y x x x x     − − −  ÷  ÷ − − −     = − = − − − + − − +     − − + − − +  ÷  ÷       3 3 n e 4   i      y x x x x     = ⇔ − − − + = − − − +  ÷  ÷         3   4  3 3 n   i      x x x x x x    − − ≥  ÷     ⇔           − − − + = − − − +    ÷  ÷               3   3 4 L   3 n i     3 4 L   x x x x x x x x  ≤ ∨ ≥       − = − ⇔  ÷         − = − ⇔  ÷       − = − −    ÷     3      4 i L  3  3 4 i L  L n n   L x x x nhan x x x x x x x loai  ≤ ∨ ≥     ⇔ =   − = − =    ⇔ ⇔     − = − + =    =     H− b3 i +e −4T + +  b 3    :  3 y y   = =  ÷   AS.=A-'Z',;Z+K,+b3+i #$12(3*!+,- Th sinh ch đưc lm mt trong hai phn (456789- :;68<=>?@A/B ./0:C b jSlBIMo%0'(N7O9=Me ⇒J[*!(*'=MMe R%&'()IMSHU3 c%0'(N.$S     Lx y+ + = Me8'!= !IM%0'(N ⇒Me3:L c%0'1'J.$%&'()S+U3o %0'(N9=.>8'C $%&'()S     3 Lx + + =  ⇒ i x = − 8F+>B%&':+U3 #h+ i − :3 jS2?8%0'(N7O−:4, A6WU LIA = R%0'(NS     Lx y+ + = 2?II  8%0'A6⇒JMI  8)) ⇒MI  [*!](*'=J 5!.O]8%0'(*') !∆I  IM lS    :3 3  M M x IM AH M y = −  = ⇔ ⇔ −  =  uuur uuur RJ[*!]*-''.IMS+−3U4 59>C$%&'()S     L  i 3 4 3 4 x y x y y x  + + =  = − +   − = ⇔   =    >   #h+ i − :3 b R#5 :: P n = uur :R#5 : : Q m = − uuur :R#5 :4:  :4:  R k n m= ∧ = − = − uur r ur R%&'()W.B9'SH−QTdU45!.SB4:WU     D D⇔ = ⇔ = ± R%&'()WS   4   4x z hay x z− + = − − = ./0:C c<    z a bi z a b abi= + ⇒ = − +  5!.C$%&'()       4    a b a a b b   − = =   ⇒   + = =      #h+S   3   ,   ,  z i z i z i z i = + = − = − + = − − 9:;68<=>?@A.>8C6 ./0:D bFS2?MH 4 :+ 4 8)* !IH*'∆ 5!.S 4 4 4 4  : ,  : AH x y OH x y= − = uuur uuur d'S    4 4 4 4 4 4    4 4 4 4 4   4  4  4  ,    4   x y y x y y AH OH AH d H Ox x y x y y  + − =  + − =  =    ⇒ ⇔    = − + =  + − =      uuur uuur  4   4 4 4 4   4 4 4 4 4  4  i k  i   4  i   4    i k  i 4  y x y y y x y x y y x loai   = − +      = − +  + − = = − ±     ⇒ ⇔ ⇒    − + =  = −   = − −      = − − <    ( ) 4 4  i k  i k:  i  i x H y  = ± −  ⇔ ⇒ ± − − +  = − +    R%&'()∆S  i   i k 4x y− ± − = FS •∆≡G+⇒M≡ISA-'IMUBM,GH •∆≡GH⇒M≡GSA-'IMUBM,GH •R∆S+UAHA≠4   AH y x AH qua A k ⊥ ∆  ⇒ = − +   59>MU∆∩IMC           :       k x y kx k k k H k k y x k y k k  = =     +   ⇔ ⇒    ÷ + + = − +     =   +                 :    4     i   i    i 4    k k k AH d H Ox k k k k k k k k loai     = ⇔ + − = ⇔ − − =  ÷  ÷ + + +      + =  +  ⇔ ⇔ = ±  − = <   #h+∆S   i  y x + = ± b]∈∆  ⇒]3T::   ::4  :: qua A co VTCP a   ∆  =   uur 5!.S  : : AM t t t= + − uuuur   p , q  :: 3a AM t t⇒ = − − uur uuuur :B]:∆  U         3      ::  4 L 3  4 k 4  L:: t t t M t t t t t M − + + − ⇔ = + + = ⇒  ⇔ − + = ⇔ − + = ⇔  = ⇒  ./0:D      4  8'   8' 4  x x y x y  − + + =   − − =   E ASHr,+r4        y x x y y x = −  ⇒ − = ⇒  = −  j  4        4 3 x loai y x x x x x =  = − ⇒ − + − + =  =  j      4     i  4  x x x y x x loai x x x  − + − + =  = − ⇒ =   − + =   =   ⇒ xU3:+U xU:+U− @5!G/C>@5!H (@/>?.,9"0IJK0L0!M- . phn (45 678 9- :;68<=>?@A/B ./0:C(*!+,-  5('<$1' 9 >GH+,!'IJ.;I3:KL,( 7 8M3:K, 7 %0'(N' 9 $8OK:4P 9 >;,.>B%&' . a a SC a   = + = =  ÷  ÷   UI #h+∆mI 7  9 %0'! 9 XH*'∆mI 68(*'= !mI 5X]! 9 *-''./I,]U   mM 5!. 3  . sinh ch đưc lm mt trong hai phn (45 678 9- :;68<=>?@A/B ./0:C b jSlBIMo%0'(N 7 O 9 =Me ⇒J[*!(*'=MMe R%&'()IMSHU3 c%0'(N.$S 

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