横並びを使いたかったので、emathEyを追加したら、エラーが発生します。
schlmath.styを外せば問題は無いようです。
schlmath.styとemathEy.styは共存ができないのでしょうか。
あるいは、\usepackageの順番が悪いのでしょうか。

すみませんが、調査のヒント等いただけるとありがたいです。
最悪の場合は、emathEy.styは使用しないという対処する予定です。

**エラー**
D:\math\exam\mkiso>platex mkiso
This is pTeXk, Version 3.1415926-p3.1.10 (sjis) (Web2C 7.5.7)
 restricted \write18 enabled.
 %&-line parsing enabled.
(./mkiso.tex
pLaTeX2e <2006/11/10>+0 (based on LaTeX2e <2005/12/01> patch level 0)
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, ukenglish, ba
sque, bulgarian, coptic, welsh, czech, slovak, german, ngerman, danish, esperan
to, spanish, catalan, galician, estonian, farsi, finnish, french, irish, greek,
 monogreek, ancientgreek, croatian, hungarian, interlingua, ibycus, bahasa, ice
landic, italian, latin, mongolian, dutch, norsk, polish, portuguese, pinyin, ro
manian, russian, slovenian, samin, uppersorbian, serbian, swedish, turkish, ukr
ainian, dumylang, nohyphenation, loaded.
(c:/usr/local/share/texmf/tex/platex/js/jsarticle.cls
Document Class: jsarticle 2009/02/22 okumura
(c:/usr/local/share/texmf/tex/latex/base/fleqn.clo))
(c:/usr/local/share/texmf/tex/platex/misc/emath/schlmath.sty
 pLaTeX2e  Ver4.07.03 2008.01.10
) (c:/usr/local/share/texmf/tex/platex/misc/emath/emath.sty
(c:/usr/local/share/texmf/tex/platex/misc/emath/emath2e.sty
(c:/usr/local/share/texmf/tex/latex/amslatex/amsmath.sty
For additional information on amsmath, use the `?' option.
(c:/usr/local/share/texmf/tex/latex/amslatex/amstext.sty
(c:/usr/local/share/texmf/tex/latex/amslatex/amsgen.sty))
(c:/usr/local/share/texmf/tex/latex/amslatex/amsbsy.sty)
(c:/usr/local/share/texmf/tex/latex/amslatex/amsopn.sty))
(c:/usr/local/share/texmf/tex/latex/amsfonts/amssymb.sty
(c:/usr/local/share/texmf/tex/latex/amsfonts/amsfonts.sty))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathC.sty
(c:/usr/local/share/texmf/tex/latex/tools/calc.sty)
(c:/usr/local/share/texmf/tex/latex/graphics/keyval.sty)
(c:/usr/local/share/texmf/tex/latex/base/ifthen.sty))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathE.sty
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathEc.sty
(c:/usr/local/share/texmf/tex/latex/tools/enumerate.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/jquote.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathK.sty))))
(c:/usr/local/share/texmf/tex/latex/amsfonts/umsa.fd)
(c:/usr/local/share/texmf/tex/latex/amsfonts/umsb.fd))
(c:/usr/local/share/texmf/tex/platex/misc/emath/hako.sty
(c:/usr/local/share/texmf/tex/latex/tools/verbatim.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathLb.sty))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathMw.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathP.sty
(c:/usr/local/share/texmf/tex/latex/graphics/graphicx.sty
(c:/usr/local/share/texmf/tex/latex/graphics/graphics.sty
(c:/usr/local/share/texmf/tex/latex/graphics/trig.sty)
(c:/usr/local/share/texmf/tex/latex/config/graphics.cfg)
(c:/usr/local/share/texmf/tex/latex/graphics/dvips.def)))
(c:/usr/local/share/texmf/tex/latex/graphics/color.sty
(c:/usr/local/share/texmf/tex/latex/config/color.cfg)
(c:/usr/local/share/texmf/tex/latex/graphics/dvipsnam.def))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPxy.sty
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPh.sty
(c:/usr/local/share/texmf/tex/jlatex209/tools/epic.sty
Enhancements to Picture Environment. Version 1.2 - Released June 1, 1986
) (c:/usr/local/share/texmf/tex/jlatex209/tools/eepic.sty
Extension to Epic and LaTeX. Version 1.1b - Released Febrary 7, 1988
))) (c:/usr/local/share/texmf/tex/platex/misc/emath/emathPk.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathT.sty
(c:/usr/local/share/texmf/tex/latex/tools/array.sty)
(c:/usr/local/share/texmf/tex/latex/tools/hhline.sty))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPb.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPg.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPsiki.sty)
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPp.sty
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPl.sty)))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathPs.sty
(c:/usr/local/share/texmf/tex/latex/misc/lastpage.sty))
(c:/usr/local/share/texmf/tex/platex/misc/emath/emathEy.sty) (./mkiso.aux)
! Use of \\ doesn't match its definition.
\owariitem ...\@gyoukan }}{}{\@gyoukan }}\\\relax
                                                  \setlength {\eda@linewidth...
l.27 \item

?

Overfull \hbox (181.69493pt too wide) in paragraph at lines 24--29
[]| [] | [] | []| []
AED: lastpage setting LastPage [1] (./mkiso.aux)

LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right.

 )
Output written on mkiso.dvi (1 page, 892 bytes).
Transcript written on mkiso.log.

D:\math\exam\mkiso>

**ソース**
\documentclass[b4paper,fleqn,papersize,10pt]{jsarticle}
\usepackage{schlmath}
\usepackage{emath,hako}
\usepackage{emathMw}
\usepackage{emathP}
\usepackage{emathPp}
\usepackage{emathPs}
\usepackage{emathEy} 

\columnseprule=0.1mm
\pagestyle{empty}

\def\HIDDEN{0}

\renewcommand{\labelenumii}{(\arabic{enumii})}

\begin{document}

\begin{Enumerate}

\item 次の漢字の読み方を答えなさい。
\begin{edaenumerate}<3>
\item 樹形図
\item 元利合計
\item 複利法
\item 奇点
\item 勾配
\item 元金
\end{edaenumerate}

\end{Enumerate}

\end{document}

▼関連発言
│
└◆8449:schlmath.styとemathEy.styは共存ができないのでしょうか？ [pop] 11/21 21:52
　├◆8450:Re:schlmath.styとemathEy.styは共存ができないのでしょうか？.. [pop] 11/21 21:53
　└◆8451:Re:schlmath.styとemathEy.styは共存ができないのでしょうか？.. [田中徹] 11/22 00:01
　　└◆8454:--- [---] 11/22 10:53<-last