\vspace{0.5cm}
\noindent
{\bf 11. $BLVL\(B.}

$B0J2<$N$h$&$J;EJ}$G9=@.$5$l$kLVL\$r9M$($h$&!%1_I=<($G9M$($k!%6J@~(B$X=x$$B$K(B($BD:E@$^$?$ODlE@$K$*$$$F(B)$B@\$9$k1_(B$x=c$$B$G6-3&1_$G$J$$$b$N$rIA$/!%$3$N$h$&$J1_$N$=$l$>$l$O$5$^$6$^$J6J@~(B$X=x$$B$r2#@Z$j!"$=$N$&$A$N$"$k$b$N$K@\$9$k!%3F8rE@$^$?$O3F@\E@$KLVL\$N(B\underline{$B1X(B}$B$,BP1~$9$k!%$3$N1XF1;N$r3NDj8I$KBP1~$9$kF;$G7k$V!%3NDj8I$K$D$$$F$O(B9$B@a$G=R$Y$?!%Nc$H$7$F!"$"$k1_(B$x=c$$B$r$3$l$+$iIA$$$F9M$($h$&!%BP1~$9$k6J@~(B$X=c$$B$N@5$*$h$SIi$N8I$KBP1~$9$kF;$r$9$Y$FIA$/!%(B($B$7$?$,$C$F$3$N6J@~$N$9$Y$F$N4pK\8I$KBP1~$9$kF;$,$"$k!%$3$l$O$9$G$K=R$Y$?$h$&$K$9$Y$F3NDjE*$G$"$k!%$3$N6J@~$N8I$GC<E@$,$$$^9M$($F$$$k9b$5$GAjB3$$$F$$$kHV9f$N8I$9$Y$F$KBP1~$9$kF;$,$"$k!%$7$+$70lHL$K3NDj8I$OB>$K$b$"$k$+$iJL$NF;$b$"$k(B)$B!%$3$l$OLVL\$N(B\underline{$B?eJ?F;(B}$B$G$"$k!%2C$($F!"(B$x=c$$B$N1X$rD>@\30B&$^$?$OD>@\FbB&$N1_$N1X$K6J@~(B$X=x$$B$N3NDj8I$GC<E@$N(B1$B$D$,$3$l$i$N1X$N$I$l$+$K$"$k$b$N$KBP1~$9$k(B\underline{$B<PF;(B}$B$K$h$C$F7k$S$D$1$k!%(B

$B$3$l$i$NF;$N$=$l$>$l$O0lJ}8~$N$_$K=d$k$3$H$,$G$-$k$h$&$K7h$a$k!%$D$^$j!"@5$N8I$KBP1~$9$k8~$-$+$"$k$$$O5U$N8~$-$K=d$k$+$G$"$k!%$3$N(B2$B$D$N$&$A$I$A$i$rA*$V$+$O0J2<$NDL$j$G$"$k!%(B$X=x$$B$NJ,;^$G30B&$N6-3&1_(B$x=a$$B$KC#$9$k$b$N$O$9$Y$FF10lId9f$G$"$j(B(3$B@a;2>H(B)$B!"0lJ}(B$x=b$$B$KC#$9$k$b$N$O5U$NF10lId9f$G$"$k!%A0<T$,$9$Y$F@5$J$iF;$O$9$Y$F@5$N8I$N8~$-$K=d$k$H7h$a$k!%H?BPId9f$N>l9g$K$O5U8~$-$H$9$k!%(B

$B$7$?$,$C$F!"(B$x=b$($BD>8rI=<($G:G$bDc$$?e=`!"1_I=<($G$OFbB&$N6-3&1_$KBP1~$9$k(B)$B$KC#$9$k<PF;$O$9$Y$F>e>:J}8~$K=d$i$M$P$J$i$:!"(B$x=a$$B$KC#$9$k<PF;$O2<9_J}8~$K=d$i$M$P$J$i$J$$!%(B

$B$o$l$o$l$NDjM}$,@.$jN)$D$?$a$K$O!"$9$J$o$A%3%s%H%"(B$C$$B$,B8:_$9$k$?$a$K$O!"(B\underline{$B;XDj$5$l$?(B} \underline{$BJ}8~$KLVL\$NF;$r=d$C$F=PH/E@$KLa$l$k$3$H$r<($;$P==J,$G$"$k(B}$B!%(B

$B0J>e$N$3$H$+$i<!$N5,B'$,F@$i$l$k!%LVL\$N1X$N$&$A!"$$$/$D$+$NF;$,E~C#$9$k$,!"$=$3$+$iF;$,=P$F$$$+$J$$$b$N$r(B\underline{$BB^>.O)(B}$B$H8F$V!%$o$l$o$l$NLVL\$N>e$GB^>.O)$r$=$l$KE~C#$9$kF;$H$H$b$K$9$Y$F<h$j5n$C$F$7$^$*$&!%$3$N$h$&$K=$@5$5$l$?LVL\$,85$NLVL\$K$J$$B^>.O)$r@8$8$k2DG=@-$,$"$k!%(B\underline{$BM6F3$5$l$?(B}$BB^>.O)$K$b(B\underline{$B85$N(B}$BLVL\$NB^>.O)$K$7$?$N$HF1$8A`:n$r9T$$!"$3$NA`:n$,=*$o$k$^$G7+$jJV$79T$J$&!%=*$o$jJ}$K(B2$B<oN`$"$k!%(B

$1^{\circ}$ $BM6F3$5$l$?$b$N$G$"$m$&$H85$N$b$N$G$"$m$&$H!"$b$O$d$I$s$JB^>.O)$b$J$$LVL\$KE~C#$7$F;_$^$k!%$3$N>l9g!"$$$^9M$($F$$$kJQ49(B$T$$B$K4X$7$F$o$l$o$l$NDjM}$O@.$jN)$D!%<B:]!"$I$l$+$N1X$+$i=PH/$7$F$_$h$&!%$3$l$OB^>.O)$G$J$$$+$i!"=PH/$9$k$3$H$O2DG=$G$"$k!%BhFs$N1X$KE~Ce$7!"$=$3$r=PH/$9$k$3$H$,$G$-$k!%$9$G$KK,$l$?1X$r:F$SK,$l$k$^$G!"$3$l$r7+$jJV$9!%1X$N?t$OM-8B$J$N$G!"#2EYL\$NK,Ld$,$"$k!%$3$&$7$F!"F;$r;XDj$5$l$?J}8~$K=d$C$F!"JD$8$?%3%s%H%"$rIA$$$?!#$3$N%3%s%H%"$,%3%s%H%"(B$C$$B$G$"$k!%(B

$2^{\circ}$ $B1X$r$9$Y$F<h$j5n$C$F;_$^$k!%$3$N$H$-!"$o$l$o$l$NDjM}$,@.$jN)$?$J$$$h$&$JJQ49(B$T$$B$r9=@.$9$k$3$H$,$G$-$k!%(B

$B$7$?$,$C$F!"$o$l$o$l$N$9$Y$-A`:n$O0J2<$NDL$j$G$"$k!%(B8$B@a$N>r7o$K=>$&6J@~(B$X=x$$B$r$9$Y$F$N2DG=$J;EJ}$G9=@.$9$k!%<!$K!"$$$^$7$,$?Dj5A$7$?LVL\$r9=@.$7!"$3$NLVL\$N>e$G$$$^$7$,$?=R$Y$?A`:n$r9T$J$&!%$3$N$9$Y$F$N>l9g$KBh0l$N>uBV$KE~C#$9$l$P!"$o$l$o$l$NDjM}$O@.$jN)$D!%$R$H$D$G$bNc30$,$"$l$PDjM}$O@.$jN)$?$J$$!%(B

\vspace{0.5cm}
\noindent
{\bf 12. $BFCJL$J>l9g(B.}

{\bf $BBh0l$NFCJL$J>l9g(B}. $B$3$l$+$iD4$Y$kBh0l$NFCJL$J>l9g$O(B\underline{$BJ,I[$,@55,(B}$B$J>l9g!"$9$J$o$A!"3F6J@~(B$x=c$$B$H$=$l$KBP1~$9$k6J@~(B$X=c$$B$N8rE@$,(B4$B@a$N0UL#$G@55,$KJ,I[$7$F$$$k>l9g$G$"$k!%$^$?$O!"F1$8;v$G$"$k$,!"3FJ,;^$NHV9f$,$=$N@J<!$H0lCW$9$k>l9g$G$"$k(B($B$7$?$,$C$F5UDlE@$b5UD:E@$b$J$$(B)$B!%(B

$B$3$N>l9g!"$o$l$o$l$NLVL\$OB^>.O)$r;}$?$:!"$7$?$,$C$F!"%3%s%H%"(B$C$$B$r9=@.$G$-$k$3$H$,8@$($k!%<B:]!"$"$k6J@~(B$X=c$$B$r9M$($k$H!"$3$N6J@~$,4^$`$N$O!"F1;~$K0l<!E*$+$D:G=*E*$J4pK\8L$G$"$C$F8r8_$K@5$HIi$G$"$k$h$&$J3NDj8I$N$_$G$"$k(B($B$?$@$7(B$X=c$$B$r(B$Y$$B$,A}2C$9$kJ}8~$K=d$k$HLsB+$7$F(B)$B!%6J@~(B$x=c$$B$,6J@~(B$X=c$$B$K@\$7$F$$$k$H$-!"$7$?$,$C$F6J@~(B$X=x$$B$KDlE@$^$?$OD:E@$G@\$7$F$$$k$H$-$ONc30$G$"$k!%<B:]$3$N>l9g!"(B2$B$D$N8rE@$O0lCW$7!"$3$N(B2$BE@$r7k$V4pK\8I$O>C$($F$7$^$$!"$=$N$?$aF1$8Id9f$N8L$,B3$/$3$H$K$J$k!%DlE@$^$?$OD:E@$r2#@Z$k#2K\$N?eJ?F;$N$&$A$R$H$D$O1s$6$+$j!"$R$H$D$O6a$E$/$3$H$,8@$($k(B(?)

$B$7$?$,$C$FDlE@$G$bD:E@$G$b$J$$1X>e$K$OB^>.O)$O$"$jF@$J$$(B(?)$B!%$J$<$J$i(B2$B$D$N<PF;$N$&$A(B1$B$D$O1s$6$+$C$F$$$/$+$i$G$"$k(B(?)$B!%$^$??eJ?F;$N$&$A(B1$B$D$O1s$6$+$C$F$$$/$+$iDlE@$K$bD:E@$K$bB^>.O)$O$J$$(B(?)$B!%(B \hfill C.Q.F.D.

\vspace{0.3cm}
{\bf $BBhFs$NFCJL$J>l9g(B}. 2$B<oN`$N6J@~(B$X=x$$B$@$1$,$"$k$H$7$h$&!%$=$N$&$A6J@~(B$L$$B$O30B&$N6-3&1_(B$x=a$$B$KC#$7!"6J@~(B$K$$B$O(B$x=b$$B$KC#$7$F$$$k$H$9$k!%(B

$B6J@~(B$L$$B$rC<$+$iC<$^$G=d$C$?$H$-$K!"=P2q$&J,;^$N@J<!$,$$$D$bA}2C$7!"(B$K$$B$r=d$C$?$H$-$bF1MM$G$"$k$H$9$k!%(B($B$H$/$KD>8rI=<($G!"(B$L$$B$d(B$K$$B$N$I$NE@$G$b@\@~$,1tD>$K$J$i$J$$$H$-$K$3$&$J$k(B)$B!%(B

$B$3$N$h$&$K2>Dj$7$?$H$-!"<!$N$h$&$K%3%s%H%"(B$C'$$B$r9=@.$G$-$k!%(B$L'$$B$H(B$K'$$B$r6J@~(B$L$$B$H(B$K$$B$NA|$H$9$k!%6J@~(B$L$$B$r:8$+$i1&$X(B($BD>8rI=<($G(B)$B=d$C$?$H$-!"$?$H$($P2<8~$-$K=d$l$PJ,;^$O$9$Y$F6v?t$G$"$j(B($B$9$J$o$AHV9f$H@J<!$,6v?t(B)$B!">e8~$-$J$i4q?t$G$"$k!%$3$l$O6J@~(B$K$$B$N>l9g$K$O5U$G$"$k!%(B

$B6J@~(B$L$$B$O6vDlE@$H4qD:E@$7$+;}$AF@$J$$!%$7$?$,$C$F5UDlE@$b5UD:E@$b;}$AF@$J$$!%$9$J$o$AAjB3$/HV9f$O@J<!$HF1$8=gHV$G$"$k!%5U$K!"6J@~(B$L$$B>e$G2<9_J,;^$,4q?t$G!"6J@~(B$K$$B>e$G6v?t$J$i!"6J@~(B$K$$B>e$G$OHV9f$,@J<!$HF1$8=gHV$GJB$s$G$$$k!%$?$@$7!"Bh0l$N>l9g$r9M$($h$&!%(B

$B$3$N$H$-(B($B$D$M$KD>8rI=<($G(B)$B6J@~(B$L'$$B$O51$$$F$$$F!"6J@~(B$K'$$B$OITF)L@$G$"$k$H$9$k!%6J@~(B$L'$$B$O51$$$F$$$k$,!"$=$N3FE@$O$I$A$i$NJ}8~$X$b8w$rAw$j=P$;$J$$!%?eJ?$K$@$1Aw$j=P$;$k(B($B6J@~(B$L$$B$,Ii$G6J@~(B$K$$B$,@5$N$H$-1&$X!"5U$N>l9g:8$X(B)$B!%$"$?$+$b3FE@$,>.$5$JJ|J*H?<M6@$r;}$C$F$$$F!"J?9T8w@~$NB+$rJ|<M$9$k$h$&$K$9$Y$F$,5/$3$k!%$3$N>r7o$N$b$H$G!"J?LL$N0lIt$,>H$i$5$l!"0lIt$O1F$K$J$k!%1F$N6-3&$,$^$5$K%3%s%H%"(B$C'$$B$G$"$k!%>ZL@$OD9$$$N$G$3$3$G$O=R$Y$J$$!%(B

\vspace{0.3cm}
{\bf $BBh;0$NFCJL$J>l9g(B}. $BFs<oN`$N6J@~(B$X=x$$B$@$1$,$"$k!%6J@~(B$L$$B$O(B$x=a$$B$KC#$7!"6J@~(B$K$$B$O(B$x=b$$B$KC#$9$k!%$3$l$i$N6J@~$N$=$l$>$l$N>e$r:8$+$i1&$K=d$k$H!"=P2q$&J,;^$N(B\underline{$BHV9f(B}$B$OA}2C$9$k!%(B

$BBhFs$N>l9g$,(B$T$$B$KBP$7$F$G$"$C$?$HF1MM!"$3$NBh;0$N>l9g$O(B$T^{-1}$$B$KBP$9$k$b$N$G$"$k!%$7$?$,$C$F!"$?$H$($P6J@~(B$K$$B$,ITF)L@$G!"0lJ}!"6J@~(B$L$$B$O?eJ?J}8~E,Ev$J8~$-$K8wB+$rJ|<M$9$k$H9M$($F%3%s%H%"(B$C''$$B$r9=@.$9$k$3$H$,$G$-$k(B($B$=$l$+$i(B$C$$B$H(B$C'$$B$rF3$/$3$H$,$G$-$k(B)$B!%1F$N6-3&$,%3%s%H%"(B$C''$$B$G$"$k!%(B

\vspace{0.5cm}
\noindent
{\bf 13. $B?^$N@bL@(B.}

$BA0@a$GD4$Y$?(B3$B$D$N>l9g$O0lHLE*$J@53N$r;}$C$F$$$?$,!"$=$l0J30$K$b$?$/$5$s$NFCJL$J>l9g$r8&5f$7!"$$$D$b%3%s%H%"(B$C,C',C'',C'''$$B$r9=@.$9$k$K;j$C$?!%$=$l$r$3$3$G$9$Y$F:F8=$9$k$3$H$O9M$($i$l$J$$!%$$$/$D$+$NNc$rE:IU$7$??^$K<($7$?$,!"@bL@$,I,MW$G$"$m$&!%(B

$BD>8rI=<($G9M$($k!%$3$NI=<($G$O(B$y$$B$,(B$y+2\pi$$B$KJQ$o$C$?$H$-F1$8?^$,F@$i$l$k$+$i!"6J@~$O<~4|E*$K8=$l$k!%$3$3$G$O(B1$B<~4|J,$7$+I=<($7$J$$$,!"JdB-$9$k$N$O4JC1$G$"$k!%(B

$B3F?^$K<($5$l$k%3%s%H%"$O%3%s%H%"(B$C''$$B$G$"$C$F!"?eJ?@~J,$GI=$5$l$k(B$X=x$$B$*$h$S(B$X=c$$B$N8L$+$i@.$k!%6-3&?eJ?@~(B$x=a$$B$H(B$x=b$$B$O%3%s%H%"(B$C''$$B$HF1MM<B@~$G=q$$$F$"$k!%0lJ}!"6J@~(B$X=x$$B$NItJ,$G(B$C''$$B$N0lIt$K$J$C$F$$$J$$$b$N$OE@@~$G=q$$$F$"$k!%(B$X=x$$B$N3FJ,;^$N$=$P$K=q$$$F$"$k?t;z$O$=$NHV9f$G$"$k!%(B$X=x$$B$N3F6J@~$N$=$P$KId9f(B$+$$B$^$?$O(B$-$$B$,=q$$$F$"$k$,!"$3$l$O8L$,@5$+Ii$K1~$8$F$$$k!%(B

$B4JC1$K<($;$k$h$&$K!"(B8$B@a$N(B6$B8D$N>r7o$,3F?^$K$*$$$FK~$?$5$l$F$$$k!%(B
1$BHVL\$N>r7o$K4X$7$F8@$($P!"$J$s$i$+$N?eJ?@~$G@Z$l$P!"$3$N?eJ?@~$K$h$C$F@Z$i$l$kJ,;^$@$1$r9MN8$KF~$l$k$H!"$"$k=g=x$NHV9fNs$,F@$i$l$k!%$=$N7k2L!"$3$NHV9f$N=gHV$K$7$?$,$C$F$3$N?eJ?@~$r2#@Z$k6J@~$rDI$C$F$$$1$P!"$3$N6J@~$O<+J,<+?H$H8r$o$i$J$$!%(B

2$BHVL\$N>r7o$K4X$7$F8@$($P!"$?$H$($P(B14$B?^$K$*$$$F!"D:E@(B63$B$OJ,;^(B6$B$*$h$S(B3$B$H$D$J$,$C$F$$$k$,!"D:E@(B45$B$O9bEY$,Dc$/D:E@(B63$B$N?eJ?@~$OJ,;^(B4$B$*$h$S(B5$B$H=P2q$o$:!"$=$N$?$a$3$N?e=`$G$OHV9f(B6$B$H(B3$B$,AjB3$$$F$$$k$3$H$,$o$+$k!%(B

3$BHVL\$N>r7o$N>l9g!"$?$H$($P(B8$B?^$K8+$k$h$&$K!"5UDlE@(B98$B$O4q?t$G$"$k$,!"5UD:E@(B87$B$O6v?t$G$"$k!%(B

4$BHVL\$b(B5$BHVL\$N>r7o$b>ZL@$,4JC1$H$O8@$($J$$!%(B6$BHVL\$N>r7o$N>l9g!"Nc$H$7$F(B21$B?^$r:N$m$&!%J,;^(B8$B$H(B7$B$O@5$G$"$j!"J,;^(B3$B!"(B6$B!"(B5$B!"(B4$B$OIi$G$"$k!%A0<T(B2$B$D$N@J<!$O$h$j>.$5$$!%$1$l$I$b$3$l$OHV9f$,$b$C$H$bBg$-$J(B($B$^$?@J<!$,$b$C$H$b>.$5$$(B)$B@5$NJ,;^$G$"$k$+$i>r7o$OK~$?$5$l$F$$$k!%(B

$B:8$+$i1&$X$o$l$o$l$N%3%s%H%"$r=d$C$?$H$7$F$_$h$&!%$3$N>r7o$N2<$G!"(B$C''$$B$N0lIt$r$J$98I(B$X=x$$B$HF1$8%3%s%H%"$N8I(B$x=c$$B!"$"$k$$$O$`$7$mBP1~$9$k8I(B$X=c$$B$O$9$Y$F3NDjE*$G$"$j!"F1$8Id9f$G$"$k!%$9$J$o$A!"(B

\hspace*{1cm}5$B?^$+$i(B7$B?^!"(B10$B?^!"(B11$B?^!"(B18$B?^!"(B20$B?^!"(B23$B?^$G$O@5!"(B

\hspace*{1cm}8$B?^$+$i(B9$B?^!"(B12$B?^$+$i(B17$B?^!"(B19$B?^!"(B21$B?^!"(B22$B?^!"(B24$B?^$G$OIi!%(B

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