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Z\<][ 4:< [ #;< . ] <#Z< :9#Z,:]9.#],:4;#]. ^:9.#Za:]9\Z[#:4]bZ#;` c7:[4:`-,:;Z,-4;,^:; .-4;, 3.3.@<<%P")>?@LU51< : 2 x 2x 1x mx = − + + + 4: 1x 3m2x 1x4 1x mx2 − +− =−− − + :9#Z,:< . ]#<].#Z,;` ^: 2 mx 1x 1x mx = − − + − − c7:<;,-[4:<≤.u[:∅^:<≠, 3.4.@<<%P")>?@ 51< :.9g#g]<Z,:;g#gZ<][ 4:< . 9#Z,:;\#Z[<].LK5#€` : 2x 1m2x2 2x 2x mx3 − −+ =−+ − − ^: 2x − 9<#Z<]\:;` c7<≤[ua4:<•Z.L<€,:<€,^: I‚q V¤n ð« 4: k •J1")>?@ =+ =+ 222 111 cybxa cybxa w; 22 11 ba ba ; , /4 . Z . /4 , / w # ; 22 11 bc bc ; , 4 . Z . 4 , / w O ; 22 11 ca ca ; , . Z . , / 6Iw≠`<≠p 51<^IO Q'+ r"AB9#; D D x -O; D D y : 6Iw;`L+w # ≠`Lw O ≠`71LU 51< 6Iw;w # ;w O ;`71 LUAB 51<C , #]4 , O; , 5" 4.1.5C5$1")>?@ tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt ,au.vece"w5Ae5055Ox</L/L-x8"/L/L vvb[a`y . : =+ =+ 1,1y7x2 8,7y24x27 4: =− =+ 21y5x13 23y9x7 : =− =− 8y9x7 3y4x5 ^: =− =+ 11y5/3x2/5 16y3/2x4/3 _: =+ =− 3y2x5 1yx3 8: =−− −=++ 22y)12(x2 12yx)12( 4.2.1 =− =− 154v7u3 50v9u5 /~O5C51L+AIO ?51<E1 = − + + = − − + 308 2y 7 3x 3 100 2y 9 3x 5 c7I;.ƒ-L;,`#;Z,byuab-O;\,u.` 4.3.5C5L+451'I!pF51 51<@< 135„#-O%='!"%B5LK5<r- 4 : +=+ +=+ 5m2myx2 1my2mx 4: =+++ =−+ 2y)1m(x)2m( 5y)2m(mx : −=−+ −=+− m1yx)2m( 1m3y2x)1m( ^: =+ +=−+ 2myx2 1my)1m(mx _: =−+− =+−+ my)4m(x)1m2( 4y)2m(x)4m( 8: =− =− 2 2 bybx ayax : =+ +=+ ab2aybx babyax 22 : =− −=− b4ybbx babyax 2 2 V¤n ð« 5: mzjkk {jk0-|jk0-{|cjk0 1) H® có nghi®m duy nh¤tF5w≠` 2) H® vô nghi®m : …w-5C5w;`< O<L+15")>?@F$ I@LU51< 3) H® vô s¯ nghi®m : …w-5C5w;`< O<L+15")>?@5B I@ LUAB51< 5" 5.1.1 +=+ =+ 1m2ymx m3myx 9<<AB: :&<%P1 51<^IOQp56 13'5'M5„$51<%='!"%B5 LK5< 4:@<<∈%P51<E1'+$AB IO c7:<≠±,-9#9#Z.:;9OZ,:9OZ[:4:Z[- Z.-Z,-` 5.2.1 +=+ =+ 1mmyx m2ymx 9<'+<AB: :&<%P1LU51<p 4:&ABIO<%P1 51<^IO Q'+ABIOp…$51<% p c7:<;Z,4:<;`79,e`:-<;Z.79[e.: 5.3.&<%P1 &<^IOQ : =−+++ =−++ 0m31y)3m(mx 0m4y8x)1m( c7<≠,-<≠[ 4: −=+− =++ )1m(2 y 2 x 2 )2m( m y 1 m x 2 )1m( c7<≠`-.-.± b -Z,± 3 5.4.@<%52IF51%P1 LUAB51< tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt ,au.vece"w5Ae5055Ox</L/L-x8"/L/L vvb[a`y [ : +=++ +=+− m3y2x)6m( m1myx4 c7<;Z. 4: −=+=+ −=+++ 1by)ba(2x)a5( aby)ba(x)a1( c7;[-4;aL;Z4;Z\± 17 5.5.@<%52IF51-4%P1LU51< −=+ +=+ baaybx babyax c7;±4≠` V¤n ð« 6: †0‡† ˆj‰oŠi 1)иnh nghîa7≥4Z4≥` ‹$?)Y*"^)>7 . ≥`-gg≥`- A ≥`-…E5ABH^QI/≥`- Œ$4@")> . ] . ] . ≥` 2) Tính ch¤t 7 :…=7 ‹=5L6H<=AB7 ≥]F≥]F ‹=LLKL6E54Q%‡3H 52I7 ≥n≥w]≥]w 9Gq7FU%)*?TL6LKL6: 4:…7 ‹5L6E4Q%‡3H <=AB^)>%)*4Q%‡3H52I -AB<@4Q%‡3%Œ52I ‹≥LK/€` A 1 ≤ B 1 ‹≥€` ≥ /n n A ≥ n B :…4•(I7 ≥n≥≥ 5" 6.1.wH%&Ž3<57 :∀-4-∈7 . ]4 . ] . ≥4]4] 4:∀-4∈74]]4≤,] . ]4 . / :∀-4--^-_∈7 . ]4 . ] . ]^ . ]_ . ≥94]]^]_: ^:∀-4-∈7 . 9,]4 . :]4 . 9,] . :] . 9,] . :≥b4 6.2.3<5 :∀-4∈ ] 7 2 a b b a ≥+ 4:∀-4∈7 2 22 2 ba 2 ba + ≥ + :]4€`7 3 33 2 ba 2 ba + ≥ + ^:∀≠`7 2 ≥+ , 6.3.∀-4-#-O∈/3<54Q%‡ 3 I5AU"AF57g/#]4/Og≤ )yx)(ba( 2222 ++ T% AIO?7a/A5],.A≤,[ 6.4 3<5$4Q%‡3?4)A_" :6I≥4-#≥O7.9/#]4/O:≥9]4:9#] O: 4:6I≥4-#≤O7.9/#]4/O:≤9]4:9#] O: :6I≥4≥-#≥O≥•7 [9/#]4/O]/•:≥9]4]:9#]O]•: ^:6I≥4≥-#≤O≤•7 [9/#]4/O]/•:≤9]4]:9#]O]•: _:T% AIO?7?<D∆'IU'IU 5:]4]≥ 3 π 9]4]: 55: ≤ ++ cba hhh S.18 ]4] 6.5.]4;,/•$<5 : . ]4 . ≥ 2 1 4: [ ]4 [ ≥ 4 1 : \ ]4 \ ≥ 8 1 w7: . ]9Z4: . ≥,]`4:%PqZ4≥Z 2 1 9 . ]4 . : :9 . ]4 . : . ]9 . 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