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!" #$ %&'( !" #$% $ &'$%()*+ ,-./0"1,2234, #-5'/0" #6789-$/0232%,: ;<=/>'57 :=/> 89-$532%,: /03?/0$@A(@A($2B A%3/C'/0"$/03?'/0 3? D,( )$ )*" )+,2%EF,:E/02E# G #H(-=I-J/02$6,'5,:3I ,( G ;E#F#)K%L#)M% )+- a) ; NO KP Q RO− + b) ;6%*. N Sx − 5T )+. G; U SN N NV Q QG Q+ − G; NO KP Q SR VN− + + G;6%* ( ) N N S Qx − = )+/2., S S S S x x x x A x x + − = + − ÷ ÷ ÷ ÷ + − G ;6%,-*'.,E G WX7E G ;6%3=Y 'E )+02., * S * N * S E * S * S − + + = + − + Y * O* S≥ ≠ GWX7.,E G;6%*.E53!Z )+1 : 2., N N S S a a a a P a a + − = + − ÷ ÷ ÷ ÷ + − G ;6%,-*'[ G WX7.,[ c) \Y3$2'6[53! N S S N − + )+2 2.,[) GSUQ KN R x xx xx −+ ++ − Y* ≥ O G WX7.,[ b) ;6%3,(I@/C'*..,]) P P −S N 3,(I )+3 2.,[U*G) N S S S S x x x x x x − + + + ÷ ÷ − + Y* ≥ O$* ≠ S G WX7.,[U*G G ;6%*.N* N +[U*G ≤ O )+ 2$%()N*+Q G \^&'$%3I G _7E$F=$2.%'&Y3`79;@-%aEFUYa=$ 79$C3I3`79=$b%bG G ;52c/0"()N*+QY3`a* )+,42$% Sy x= + $ Qy x= − + G \^&$%3I4-3`29a*( G F!&*292.%E'/0"3I c) ;6%3'%./0" U SGy mx m= + − &d,Y/0"3I )+,,2$%()UKeNG*+QeUSG G;6%3'.$%USG& G;6%.&'$%USG22Y/0"()*eN G\^&'$%USG)S )+,-\D/C36'/0!U@G5-5!V$d,.%8UNLSG )+,.2$%()U%eNG*+N%+S567 G \Y3$2'%6$%& G ;6%%.&$%UfG22Y/0"()N*eS )+,/ G;3I4-3`79^&'$%, U@ S G()*+N$U@ N G()eN*+P G;6%792.%E'U@ S G$U@ N G!DgD G;52c/0"U@ S GY3`a* )+,02%EF,:E/02E#F M L SNAB cm AC cm= = a) ;25FU=$%3?9G$9@$F# b) _7hLi=$6,'#3IEFLE%EhEF)EiE )+,12j/03?UaG/0EF)NW\^/03?A%k/0aF Gl/03?UaG$UkGD*X, G\^@A(Fm'/03?UaGUFm/0G@A(Fm1/03?UkG 8%k8nnam )+,22%EF,:cE5 · O ZOABC = $ RAB cm= ko/02E# U#,9FG;E#LELF )+,32j/03?UaG/0EF_7E*LF(=$,:5YEFUE*LF( $j/03?4,9%9j%pD"0EFG],.%8,9j/03?U8 E$FGoD,(Yj/03?51E*$1F(m G % CD AC BD= + $ · O MOCOD = G Em1Fq% n nMN BD G ;EFm:r.%8@,(.3Ij/03? @G_7#=$3,.%'E8%.%a#"$ )+,2 26,:EFm],.%E^%9/0"1Fh$1/0 "mi%3! NNN SSS FA Α + Ε = ΑΒ Hết )+ 8 )"9&:"9 )+, GE# N )F## OP GE# N )KM)QZ)sE#)ZU%G OP )+- G NO KP Q RO KP MP Q SZP N P Q P QK P SS P − + = − + = − + = ONP ONP G N Sx − 5N*eS ≥ O ⇔ * S N ≥ OP )+. G U SN N NV Q QG Q+ − )Z+NMeQQ)SP G NO KP Q SR VN KP MP Q MN QZN N P Q P M N Z N P SP N − + + = − + + = − + + = − + ( ) N N S Q N S Q N S Q N S Q N K N N N S x x x x x x x x − = ⇔ − = − = ⇔ − = − = ⇔ = − = ⇔ = − \(D-%'D/C36=$ { } NL SS = − )+/ G,-*'.,E=$ O L Sx x≥ ≠ G ( ) ( ) ( ) ( ) S S S S S S S S S S S S S x x x x A x x x x x x x x x x x + − = + − ÷ ÷ ÷ ÷ + − + − ÷ ÷ = + − ÷ ÷ + − = + − = − G O O S Sx x x ≥ ⇔ − ≤ ⇔ − ≤ _3=Y 'E=$S*)O )+0 G N U * SGU * SG U * SG E * S * S − + + = + − + U * O* S≥ ≠ G OP ) * S * S+ + + ) NU * SG+ OP ;7E)Z NU * SG Z⇔ + = U * O* S≥ ≠ G * S Q⇔ + = * N⇔ = * K ⇒ = U;8kG \(E)Z6*)K ONP ONP ONP ONP )+1 a) ,- { { O O S O S a a a a ≥ ≥ ⇔ − ≠ ≠ G N N S S a a a a P a a + − = + − ÷ ÷ ÷ ÷ + − U SG U SG N N S S UN GUN G K a a a a a a a a a + − = + − ÷ ÷ ÷ ÷ + − = + − = − G N N S U N SG N S S N N S K P N P a a − = = − = − + ⇒ − = − ⇒ = − )+2 GWX7.,[ [) GSUQ KN R x xx xx −+ ++ − Y* ≥ O ) xxx NSQQN −=−+− G;6%3,(I@/C'*..,]) P P −S N 3 ,(I ]) P P −S N ) N SNS GNSUS GNSUN −= − = −− − xx x x x ] S S =⇔Ζ∈⇔Ζ∈ x x )+3 GWX7.,[ [) N S S S S x x x x x x − + + + ÷ ÷ − + Y* ≥ O$* ≠ S ) N U SG U SG S U SGU SG S S S x x x x x x x x − + + = − + = − ÷ ÷ − + GN* N +[U*G ≤ O N N S O UN SGU SG O S N S O N S O S S S N N S O S N S O S x x x x x x x x x x x x x ⇔ + − ≤ ⇔ − + ≤ ≥ − ≥ + ≤ ≤ − ⇔ ⇔ ⇔ − ≤ ≤ − ≤ ≤ + ≥ ≥ − k>D,-,(3 S O N x≤ ≤ )+ F$N G\^&$% * OSP ()N*+Q QO UONPGUOVPG G S Q M Q N N K OAB S = = G;5;EFa) O QSP N ZQ NZtABO= ⇒ = O O O SRO ZQ NZt SSZ QKtABx⇒ = − = \(52c/0"()N*+QY3`a*=$ O SSZ QKt )+,4 G\^&'$% * S O ()*+S O S * O Q ()*+Q Q O Gq63I&5792.%'/0"=$EUSLNG G/0" U SGy mx m= + − &d,Y/0"3I5 d,.%EUSLNG ;5 N S S Q N m m m = + − ⇔ = \( Q N m = 6/0" U SGy mx m= + − &d,Y/0" 3I )+,, G#$%USG&KeNsOu)suN OP x y -1 y=x+1 y=-x+3 Hide Luoi 1 2 3 O 1 A 3 G&'$%USG22Y/0"()*eN K N S Q N a a − = − ≠ − Qn N P Q n N a a a = ⇔ ≠ ⇒ = ONP ONP Gk)S5$%()*+N ONP * O N ()*+N N O FB3ONP.% \^X&OP.% ONP OP )+,- \D/C36'/0!U@G5-5!V$d,.% 8UNLSG )+,. 2$%()U%eNG*+N%+S567 <7\Y3$2'%6$%& G;6%%.&$%UfG22Y/0"()N*eS )+,/ G;3I4-3`79^&'$%, U@ S G()*+N$U@ N G()eN*+P G;6%792.%E'U@ S G$U@ N G!DgD G;52c/0"U@ S GY3`a* )+,0 E F C B A H ONP <7 ;9@$F#$25FU=$%3?9G F) N N N N M SN SPAB AC+ = + = U%G ONP EF N )FF# N N M SP AB BH BC ⇒ = = )PKU%G ONP ;F) SN K M Q AC AB = = ⇒ µ Β ≈ PQ O ONP ;7 %EhEF)EiE ∆ EF#,:#/02#h ⇒ E# N )EFEh ONP x Y y=x+2 B A -1 O 1 ∆ E#,:#/02#i ⇒ E# N )EEi ONP \(EhEF)EiE OP )+,1 M K O A B D ONP <7 =>?@=<A?B57C+5 7?DEFGH=<I$ ;5k=$A%/03?/0aF qIk=$3,.%'aF ONP ⇒ ak+kF)aF ⇒ ak)aFekF ONP #(ak)We3 \(/03?UaG$UkGD*X32F ONP ;7 =>J= KK ;5 ∆ a8F9D/03?/0aF qI ∆ a8F,:8 OM MB⇒ ⊥ ⇒ 8m)8F ONP 8$ak)kFUF/03?A%aG ONP m258k=$/03,6'%amF ONP ⇒ k8nnam ONP )+,2 G;E# ;%EF#,:#5 Q 2 R K Q N AH AB B= = = U%G G;E ;%EF,:E5 R QAC AB B= = U%G G;F ;5 RR Q SZ U G K Q AH BC AB AC AB AC AH cm BC = ⇒ = = = )+,3 G%m)E+Fm ;5 8)EU8LE=$ND,(G m8)mFUm8LmF=$ND,(G 60 8 H B C A x y N C D O A M B 9b2/>8+m8)E+mF #(m)E+Fm G% · O MOCOD = ;b2 'D,(1,6 a=$DA'5Ea8 am=$DA'5Fa8 8$_5Ea8$5Fa8=$54I OC OD⊥ ( · O MOCOD = G%8q22YFm ;5 n nAC BD U4,:5YEFG CN CA NB BD ⇒ = %$ LCA CM BD MD= = U%G n n CN CM MN BD NB MD ⇒ = ⇒ U=B2;=bG )+, G%am) O MO ;5a=$DA'Ea8UE8=$D,(G am=$DA'8aFUm8mF=$D,(G 8$Ea8$8aF=$54Iam) O MO G%m)E+Fm ;5E)8U D,(2,G Fm)m8U D,(2,G ⇒ E+Fm)8+m8)m LMm)E+Fm G ;EFm:r.%8@,(.3Ij/03? ;5;%am,:L5a8=$/02I 88m) N a8 ) N R U:rG 8$E)8$Fm)m8U%G qIEFm) N R U:rG.%8@,(.3Ij/03? )+-4 % NNN SSS FA Α + Ε = ΑΒ E D M B A C F ],E@v/0",:5YEi/0"$(1 /0"m8 ;5;Eh89DU6 ∠ hE8) ∠ h8)MO O G ⇒ ∠ E8h) ∠ Eh)KP O U ∠ Eh)KP O ; 6,:G ⇒ ;%E8h,:AE ⇒ Eh)E8 ∆ E8i,:E5Em=$/02I NNN SSS FAMD Α += Α \6Em)EFU6,:GLE8)EhU%G \( NNN SSS FA Α + Ε = ΑΒ . _7E$F=$2.%'&Y3`7 9 ;@-%aEFUYa=$ 7 9 $C3I3`7 9 =$b%bG G ;52c/0"()N*+QY3`a* )+,42$% Sy. cm= ko/02E# U# ,9 FG;E#LELF )+,32j/03?UaG/0EF_7E*LF(=$,:5YEFUE*LF( $j/03?4 ,9 %9 j%pD"0EFG],.%8 ,9 j/03?U8 E$FGoD,(Yj/03?51E*$1F(m G. ;EFm:r.%8@,(.3Ij/03? @G_7#=$3,.%'E8%.%a#"$ )+,2 26,:EFm],.%E^ %9 /0"1Fh$1/0 "mi%3! NNN SSS FA Α + Ε = ΑΒ Hết )+ 8 )" ;9& amp;:" ;9 )+, GE# N )F##
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