* L ưu : !"#$ %" !&'()%" !"# $%&' 1) #'$( )*+", /01,2*+,-./-&01" 2%3+,4"5671"89 *:$;7 ;8<=> 8%", !* ? @>7 ;A 2) #+", /01,3BC/1D)E1"D"D0" D-1"2%8 =*!DFF1"#1" Lưu *G-=$(HI2, !4DJ K+,-.LCM*:=,%"54HC* 7 N#"#1=&OA8 7:/&3$(H9 7:*P:!$4#,CE"-="888 QR* ++=+ −=− ? S yxyx yxyx P?AA?< =++ +−=+++ ? ?? R RTS9R93R3 xxxy xxyxyx < += −=− R? RR S xy y y x x U?AAS Q?*3VR9 =+ =++ SA RR ?? xyyx yxxy < =+++ =++ W R?9R93R3 ?? yxyx yxxy < =+ =+ SXW RX? SS ?? yx xyyx < =++ =++ YT Z9?93?3 ? yxx yxxx =−++ =+++ yxyx yxyyx 9?93R3 T93R ? ? < = + + = + +++ S R ? [ 93 S 93TT ? ?? yx x yx yxxy < =++− =++− A?YS ARS ??? ??? xyyyx xyyyx QS*3V?9 + = + = ? ? ? ? ? S ? S y x x x y y 3P?AAS9< =− =+ X X ? ? xy yx ; =−+ =−+ ?? ?? xy yx QT*3+>9 =+ −=− R SS YY SS yx yyxx 3%C\-9; += −=− R? RR S xy y y x x ; =+ −=− RAT% ? % ? ? ? y x yxee yx 2$( )*45 '$( )*.6,7 )8 9# +", ]=*^D_C,C* 7_` 7P1-.N 7:$(H^4H#,C-="888 Q* A?S?TS ? =++−−+ xxx < RTS?S? =++− xx < R?TR +≥− xx Q*!P !C,* R?R ? ≤+−− mxmx 3+*M1"PP!9 Q*!P !* ?9?3XY ? +−≤+− xmxx a1I3+*bc?d?9 3 $( )*45 '$( )*.6: .; ]=*^e6C* 7P1-.N 7:$(H32 !f, !9^4H#,CE""#88 7!D&"1gP !%'Ph%5=8 QR* ARTRYW ? ≤+−+− xxx < i]PiijC8S xxx ?RRT −=−−+ <i]Pi ijC8S S [ S S 9RY3? ? − − >−+ − − x x x x x 8U8?AAT Q?* i]Pi ijC8S <AZS?9?3? ?? =−−−+− xxxx i]Pi ijC8S [ ? R ? ? S S −+<+ x x x x <i]PiijC8S ?RR ?? =−++−− xxxx < EMBED Equation.DSMT4 ( ) ? ? ? S ? R ? ?x x x x+ − + = + + (t= ce(H-9); i]PiijC8S R??R9RT3 ?? ++=+− xxxx < i]PiijC8S R?R?9R3? ?? −−=−+− xxxxx HD: Đặt EMBED Equation.3 R? ? −+= xxt . QS* A?S9S3 ?? ≥−−− xxxx 8?AA?< QT*:1g,* ( ) S S S S ?X ?X SAx x x x− + − = ; RR? S −−=− xx ; S S R??R −=+ xx QX*+"* ( ) ( ) ( ) ? ? ? R ? T T T S ? Z S Ax x x x x+ + + + + + + = <=>?@A KCaùc +B ,CBheä PT : ? ? ? ? S3 9 x x y y x y x y + = + + = + 8AS<!,,* −=+ =+ myyxx yx SR R 8AT< S R R ? R x y x y y x − = − = + U8AT< !,* −=+++ =+++ RARX RR X RR S S S S m y y x x y y x x 8A[< ? S ? T ? X T X 3R ? 9 T x y x y xy xy x y xy x + + + + = − + + + = − U8AW< +=+ +=++ YY? Z?? ? ??ST xxyx xyxyxx P8AW< ? ? ? ? R ? ? xy x y x y x y y x x y + + = − − − = − 8AW< ? ? ? R [ R RS xy x y x y xy y + + = + + = P8AZ< ? ? 3 R9 S A X 3 9 R A x x y x y x + + − = + − + = 8AZ< =−++ =−−++ [TS?T A?X9S39RT3 ?? ? xyx yyxx U8RA8 Caùc +B ,CB .6: . S [ S S 9RY3? ? − − >−+ − − x x x x x U8AT< T?RRX −>−−− xxx U8AX< RSR? ? +−+− xxx 8AY< ! !C,* T ? R?RRS −>++− xxmx U8A[< ! !C,N&,* mxxxx =−+−++ Y?Y??? TT U8AW AWXYS?S? S =−−+− xx U8AZ< RX??R +≤−++ xxx G:8AZ< AWRTSYRS ? =−−+−−+ xxxx P8RA< R 9R3?R ? ≥ +−− − xx xx U8RA88