Đại số 11 NC tiết 70

      !"#$ %& ! """"### %&'$%&'('! ')   *  "  + x x x x x →− − − + , - *  + * " x x x →−∞ + − '   * . " + / x x x x − → − + −     + x x x x x + → + − %&(*%&!(01')'('2!3!+45'04,6 05'  * 78 *   8* 9 9 .8 9 x x f x ax b x x x x  − ≤  = + < <   − + ≥  %&)":3!0;!2!0& *  - " x x− + = '<=!*!>?' ,> Ht       !"#$ %& ! """"### %&'$%&'('! ')   *  "  + x x x x x →− − − + , - *  + * " x x x →−∞ + − '   * . " + / x x x x − → − + −     + x x x x x + → + − %&(*%&!(01')'('2!3!+45'04,6 05'  * 78 *   8* 9 9 .8 9 x x f x ax b x x x x  − ≤  = + < <   − + ≥  %&)":3!0;!2!0& *  - " x x− + = '<=!*!>?' ,> Ht !  *%+,-.&/0."#$ @AB'+C'('8('=!&'DE1')F# @A04 =!G'=!HC8I'J!'<'!'8! D(K ')F<# LM'+0N+4CDE1O59#99#9E9#.9-#  P !Q'R %! "  ! """"### '12 %'<  " " " " " """"### # ### " " " " "   = + + +  ÷   1,0 LE+S!')6'R+T ! " " " u = '!,6 " " q =  0,5 U< " " " $ """" # " " // ** " " = = = − 0,5  %O'('!  )12   *  "  + x x x x x →− − − + 1,0  *  " " "   "  + +  "  + * x x x x x x x x x x x x x →− →− →− − − + − = + + − = = 0,5 0,5 , - *  + * " x x x →−∞ + − 1,0 * * - - - * * * * *   " "  + + + " " * " *  *  x x x x x x x x x x x x x →−∞ →−∞ →−∞ + − + + = = − − − 0,5 - *  " " + " * * x x x →−∞ − + = − − 0,5 '   * . " + / x x x x − → − + − 1,0    * * * $  . " + + * *  / x x x x x x x x x − − → → − − − + = − + − * $ - + - * x x x − → − = = + 0,5 0,5     + x x x x x + → + − 1,0             + +   x x x x x x x x x x x x x x x x + + → → + − + − + + = + + V 0,5 V       " + +   x x x x x x x x x x + + → → = = +∞ + + + + 0,5  * %&!(01')'('2!3!+45'04,6 05'  * 78 *   8* 9 9 .8 9 x x f x ax b x x x x  − ≤  = + < <   − + ≥  3,0 W   * 7f x x= − 8 *x−∞ < <   f x ax b= + 8 * 9x< <     9 .f x x x= − + 8 9 x< < +∞ 4C1+O  f x +45' 04'('8X!  Y**Y99  −∞ +∞  B, 1,0 W% *x = '< * "f =  * * +   +* 7 " x x f x x − − → → = − = * * +   +  * x x f x ax b a b + + → → = + = + U<  f x +45'HV*8'Z8 * "a b+ = 0,25 0,25 0,25 W%HV9'< 9 .f =  9 9 +   +  9 x x f x ax b a b − − → → = + = +   9 9 +   + 9 . . x x f x x x + + → → = − + = U<  f x +45'HV98'Z8 9 .a b+ = 0,25 0,25 [E0  f x +45'\!]HV*HV98'Z8 ,+!>')> * " * 9 . 7 a b a a b b + = =   ⇔   + = = −   ^E  f x +45'04,605'8'Z8 * 7a b= = − 0,5 0,25 $ :3!0;!2!0& *  - " x x− + = '<=!*!>?' ,> 1,0 _` *    - "f x x x= − + %'<   *  " " *  9f f f f− = − = = − = [E02!0&a''<!>04b8X!  YY""Y− ^&2!0&,'*'<8!D(*!>?',>42! 0&a''<=!*!>?',># 0,5 0,25 0,25       !"#$' %& ! """"### %&'$%&'('! ')   *  "  + x x x x x → + − − ,   +  * x x x x x →−∞ + + + '    9 - + $ x x x x − → − + −      + x x x x x + → + − %&(*%&!(01')'('2!3!+45'04,6 05' "8 *   8* 9 .8 9 x f x ax b x x ≤   = + < <   ≥  %&)":3!0;!2!0& *  - " x x− + = '<=!*!>?' ,> Ht       !"#$' %& ! """"### %&'$%&'('! ')   *  "  + x x x x x → + − − ,   +  * x x x x x →−∞ + + + '    9 - + $ x x x x − → − + −      + x x x x x + → + − %&(*%&!(01')'('2!3!+45'04,6 05' "8 *   8* 9 .8 9 x f x ax b x x ≤   = + < <   ≥  %&)":3!0;!2!0& *  - " x x− + = '<=!*!>?' ,> Ht !  *%+,-.&/0."#$' @AB'+C'('8('=!&'DE1')F# @A04 =!G'=!HC8I'J!'<'!'8! D(K ')F<# LM'+0N+4CDE1O59#99#9E9#.9-#  P !Q'R %! "  ! """"### '12 %'<  " " " " " """"### # ### " " " " "   = + + +  ÷   1,0 LE+S!')6'R+T ! " " " u = '!,6 " " q =  0,5 U< " " " . """"### # " " // ** " " = = = − 0,5  %O'('!  )12   *  "  + x x x x x → + − − 1,0  *  " " "   "  + +  "  + * x x x x x x x x x x x x x →− →− → + − − + = − − + = = 0,5 0,5 ,   +  * x x x x x →−∞ + + + 1,0  " " "  "   + + + *  *  *   x x x x x x x x x x x x x x x →−∞ →−∞ →−∞   − + +  ÷ + + + +   = = + + + V 0,5 " "  " + *   x x x →−∞ − + + = + 0,5 '    9 - + $ x x x x − → − + − 1,0       *  9 - + +    $ x x x x x x x x x − − → → − − − + = − + −  * " +   x x x − → − = = + 0,5 0,5      + x x x x x + → + − 1,0                + +    x x x x x x x x x x x x x x x x + + → → + − + − + + = + + V 0,5 V         + +     x x x x x x x x x x + + → → = = +∞ + + + + 0,5  * %&!(01')'('2!3!+45'04,6 05' "8 *   8* 9 .8 9 x f x ax b x x ≤   = + < <   ≥  3,0 W   "f x = 8 *x−∞ < <   f x ax b= + 8 * 9x< <    .f x = 8 9 x< < +∞ 4C1+O  f x +45'04'('8X!  Y**Y99  −∞ +∞  B, 1,0 W% *x = '< * "f =  * * +   +" " x x f x − − → → = = * * +   +  * x x f x ax b a b + + → → = + = + U<  f x +45'HV*8'Z8 * "a b+ = 0,25 0,25 0,25 W%HV9'< 9 .f =  9 9 +   +  9 x x f x ax b a b − − → → = + = +  9 9 +   + . . x x f x + + → → = = U<  f x +45'HV98'Z8 9 .a b+ = 0,25 0,25 [E0  f x +45'\!]HV*HV98'Z8 ,+!>')> * " * 9 . 7 a b a a b b + = =   ⇔   + = = −   ^E  f x +45'04,605'8'Z8 * 7a b= = − 0,5 0,25 $ :3!0;!2!0& *  9 " x x− + = '<=!*!>?' ,> 1,0 _` *    9 "f x x x= − + %'<   9  " "   .f f f f− = − = = − = [E02!0&a''<!>04b8X!  YY""Y− ^&2!0&,'*'<8!D(*!>?',>42! 0&a''<=!*!>?',># 0,5 0,25 0,25       !"34,5- %& ! """"### %&'$%&'('! ')   *  "  * +  x x x x x → + − + − ,  * +  * x x x x x →−∞ + + + '   $ 9 $ + "- x x x x − → − + −     9 + x x x x x + → + − %&(*%&!(01')'('2!3!+45'04,6 05' *  * "8 *   8* 9  *8 9 x x x f x ax b x x x  − + ≤  = + < <   − ≥  %&)":3!0;!2!0& *  $ " x x− + = '<=!*!>?' ,> Ht