!"#$%!&'() *%+ ,-& ,.!/&&&0&1% ,%%#2(344& 56, x y 12 = 7%+ 89:9 8(0; .!/&&0&<= >,'6 :9344& 8(0; x y 500 = ?%=%; ?%=%; !"#$%&'( )*+,-#.//0%&$ *+,-1& §. 2)34567894:;<7 => )?@& A ,%@A'B&C5"% BDEADEFGH3:IJ%A 'B&C5"%BDE 6 A'B&C5"%BDEFGH3 #!/5%@,-&)&K6 3,5 x y − ⇒ = 3,5 y x − = ⇒ A'B&C5"%B DEFGH3 L@(A'B&C5"% BDEA'BFGH3A 'B&C5"%BDEA 'B,%+( L@(A'B&C5"% BDEA'BFGH3A 'B&C5"%BDEA 'BFGH3 L@(#%'!/&'%+B5"%#% '!/&)&K :9'6-&DE>4 %A'B&C5"%BDEA 'B a y x = BC M%A'B&C5"%B DEA'BA'B&C5"% N&BDEA'B56% %#%'!/&#A'B&C5"% ( §2D)34567894:;<7 A>E L@(%#%'!/&A'B&C5"% (; %&%>0C!O&K& P&'())&#$%,-&B DEA'B : 9 : ADE%&%>0C,<#% '!/&6,-&&C#= ADE%&%>0C!O&K&#% '!/&%: 1 2 2 1 x y x y = 2 ,%@%#%'!/&56 A'B&C5"%(; 4 3 Q 9 G 9 9 9G4 Q 93 G 9Q 9G 9 BDEA'B; 1 1 1 1 . 2.30 60 a y a x y x = ⇒ = = = ,*<(RS0&,=&,-& TDE /UV WX&52 %&%>0C !O&K& H H G G H Q Q 56 9 9 G G 9 Q Q 94 : 94 94;G94 G : G 94 G 94;Q93 .YZ[L\]^L?_ `6%WU03a8?M ,%@%#%'!/&56A 'B&C5"%(56%9a 93: BDEA'B: ,Ib,%c(*%d: &%>0C%9V94 a y x = e56'6%#%'!/& A'B&C+; 9aV93; 9:9a:394 , 120 y x = M% 120 6 20 6 x y= ⇒ = = M% 120 10 12 10 x y= ⇒ = = `6%WUG03a8?M ,%@56'6%#%'!/&A'B &C:f%2DE /U56) 0E&0&,=&D(; 4H3 FH Q G F H3 A D2 =A DF = ?/%g; 7h56T6#c BDE 9H3:Q9 6 6 12 0,5 y y x = ⇒ = = 6 6 5 1, 2 y y x = ⇒ = = − − 6 6 1 6 y y x = ⇒ = = 6 6 6 2 3 y x x y = ⇒ = = = 6 6 6 3 2 y x x y = ⇒ = = = − − T `6%WUQ03a8?M ,%@G3)&T &)%6@a&6:IJ%a )&&)%6#@ ,%+(&6 1 2 2 1 x y x y ⇒ = i;fcT&)%6; G3)&@a&6 a)&@&6 j&T)&5%BH&%DE)& 56DE&6'6'6%#%'!/& k(B@6 <%#%'!/&A'B &CHA'BK6 K&5"% K&5"% >;fcT&)%6; G3)&@a&6 a)&@&6 ?%=%; 8E)&56DE&6'6'6%#% '!/&A'B&C:; 35 35.168 210 28 168 28 x x= ⇒ = = 0='l%;a)&&)%6 # @4&6 >;?m%DE)&'656DE &6'6: en&D(<'65%B1%&6 '6!(+DE)&A'B &C5"%DE&6::7#; . a y a x y x = ⇒ = 9G3V9a569G3:a 7#H9a 35.168 210 28 a y x = = = o(BA'B&C 0$0 G H'.#)3 4567894I G ;J G 7#)3 4567894I G 78K( ?%" L 1>M ⇒ = = A A M L M ⇒ = A A = M L M M%%#%'!/&A'B (W K&5"% K&5"% M%%#%'!/&A'B &C K&5"% K&5"% & L M IpqL?7rLesLIt FLi5&#C&u56 <%#% '!/&A'B&CDD>5"%A'B(W F`6%WUDE30&3a8?MF`6%aHvH4H H0&Q3FQ8` Fw0!"NQxTDE,6%>52A'B&C . @4&6 >;?m%DE)&'656DE &6'6: en&D(<'65%B1%&6 '6!(+DE)&A'B &C5"%DE&6:: 7 #; . a y a x y x = ⇒ = 9G3V9a569G3:a 7 #H9a 35.168 210 28 a y x = = = o(BA'B&C 0$0 G H'.#)3 45 678 94I G ;J G 7 #)3 45 678 94I G 78 K( . = o(BA'B&C 0$0 G H'.#)3 45 678 94I G ;J G 7 #)3 45 678 94I G 78 K( ?%" L 1>M ⇒ = = A A M L M ⇒ = A A = M L M M%%#%'!/&A'B (W K&5"% K&5"% M%%#%'!/&A'B &C K&5"% K&5"% & . !"#$%&'( )*+,-#.//0%&$ *+,-1& §. 2)345 678 94:;< ;7 => )?@& A ,%@A'B&C5"% BDEADEFGH3:IJ%A 'B&C5"%BDE 6 A'B&C5"%BDEFGH3 #!/5%@,-&)&K6 3,5 x y − ⇒