87. i !4 j
i x “ !5 j
t
h !4 i !8 P j
t p !5 o o
h !4 i !8 P j
p
!5
h !5
l !6
88. 1/ o k
u 49
e i ʼ j e
k p)( ) w x),2+(f).2((w ),2((x
k p ): t t
- -%/ ]M[[Z Z-- ):w())% +)% )+)x
p w x
pk
k pk0(
k p t t × t
t w7ZDE9Bo t x
k p . w 6?B ()/x
89. K Z -L
p d d
n t
u t “ u
ʻn l l • 5
n l “ t
http://costep.open-ed.hokudai.ac.jp/like_hokudai/contents/article/1218/