Dạng toán 1 potx

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3-E%6F/&FG%%*'(")*% • =,H%-"&I&/ • +<6,,J?@ %? K  K K L #LI%'M%)7%!67$%& &#1 !$%& +,%-%*. #/0 1. N 2 1440,O%' C%?0P&?24'Q A6<3/4)7%!6767$%&,R &#1 !$%& +$%& 2 ,% #6A%? &*% 6 + S6/0# B&*%. 2 T 3/4$%& 8 =/0'>64?. @L #1 !$%&'%)*% &#1 !$%&'%)*% 2  A ! $%&'%)*%     !"#$% &'&(&) *+,--. 1!%' $# C S', • /0U • F • V)?! $6<'(/0 • :*)?B!%';C W%6;&# • ()6/&!?%* /01X L. 2 +Y)7%CS'YCS' %$"S"S!# 1)?!CS'C6.Z C%?0P&? L %' CS' +,%-%*. • /0. • 1. • 1Y +CS' C%(0P&? ; 10. 23-)45! 26V. V%'  CS' 26V. V%'  CCS' 276V. V %' )7%CS' 286V. V%'  CS' 296V. V%'  L)7%CS' Dạng toán 2 : Điều kiện để hàm số đạt cực trị tại một điểm6 • Điều kiện để hàm số có cực trị tại • Điều kiện để hàm số có cực đại tại  • Điều kiện để hàm số có cực tiểu tại  • :3&7&'&(&)&'&(&%&(&   C%?0P&? • Điều kiện để hàm bậc 4 có 3 cực trị : CD%?0P&?  ! S! +,%-%*. /0 1 1)?!I! 6.  96/. 23-)45! @L %' ! S!  AL  !CDS' D1 ! S [L 1 !S'&M%  \L 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'(  &# '(  # '(  2:a2: # '(  &# '(  # # '(  27:a2: # &# #  !"#$ %&'()*+,-./)-//+ 01234506 Phương pháp giải: :*j&4(<.%' ! C%'6  %';#'( 6 6#2C!i"'%  /01+ 6(k'( /& • F • :*0,O%' !%? • F%'  • B)`*'(2:a :#2%*j6 • :*0,O%' !%? • ()6/&!& /& • V)?!&0,O%'. ,R;5 • :*)?B!%' ;)?B( • V)?!0,O%'. C%? • :*)?B!%' ;)? • l%',Rm&,AD!'%';&  • ()6/&!& /&7 • F • :*0,O%' !%? • F%'  • a<6,R%*0,O%'. ! %? n% • 4 )!''S0i%' SS;& !/Y6%' • ()6/&!& 23- V. V%'o6io %'6'( 6 Hướng dẩn giải: • C . 2/4 N • /'M%. 2 • U/4%'6'( Y Y 24' •  @# •  A# • U 2(B @#4' • U 2(B A#4' 3 24,R.  =*%&(. iS6/0# 3/4%'6'( 6 24' )7%;& l4' 6 3 24,R. =*%&(. iS6/0# 3/4%'6'( 6 l4'%' ;5& • 96/.:'<.  .   Dạng toán 1: Xét sự biến thiên của hàm số Phương pháp giải: •  •  •.  K K L #LI%'M%)7%!67$%& &# 1  !$%& +,%-%*. #/0 1 . N 2 1 440,O%' C%?0P&?24'Q A6<3/4)7%!6767$%&,R &# 1 . CS' +,%-%*. • /0. • 1 . • 1Y +CS' C%(0P&? ; 1 0. 23-)45! 26V.