1. l21= [', 1J ^-'
l',11 = 1 ',-)l )x-'t
-z- > to .[x*f, .+ x-'l " -+ ---+
t4. L ="f i +tt -^
2
f
-t-i +4t r'?t
nYb,'^',!u a'b= o
" 0
!= -?; +zS+L ??Qzl lY-A +^q.F=
_r,rfil;T:r=_16
trs -9 =-'tffi - -hL (E
-zoi-ruJ
- -- tlb 9L
-(--zn.
+Lb+&)
19. ,4(1,?,-,) 1
D -4) f
G,7,
c(q,9,-D )
l-+
i
C-sa ,L ftv( =
W t Abc, *r, @