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<DIV>Bonjour , <BR><BR>Look a this tex file. There is questions in the tex file.
<BR>I you have answer to the questions please send me this answers by
mail.<BR>Thanks.<BR><BR><BR><BR>\documentclass[10pt]{article}
<BR><BR>\usepackage[latin1]{inputenc} <BR><BR>\usepackage[T1]{fontenc}
<BR><BR>\usepackage{calc} <BR><BR>% \usepackage[fleqn]{amsmath}
<BR><BR>\usepackage{amsmath} <BR><BR>\usepackage{amsfonts,amssymb}
<BR><BR>\usepackage{mathtools}
<BR><BR>%----------------------------------------------------------------------------------------------------------------------------
<BR>\usepackage{geometry} <BR>\geometry{nohead,nofoot}
<BR>\geometry{a4paper,dvips} <BR>\geometry{portrait}
<BR>\geometry{left=2cm,right=2cm,top=2cm,bottom=2cm}
<BR>%----------------------------------------------------------------------------------------------------------------------------
<BR><BR>\usepackage[frenchb]{babel} <BR>\frenchbsetup{StandardLists=true}
<BR><BR>\begin{document} <BR>%\abs{ \frac{4}{5} } <BR>% the documentation of
mathtools talks about \abs and \norm but it doesn't work <BR>% \norm{
\dfrac{4}{5} \vect{AB} } <BR>% <BR>\noindent <BR>10 \\
<BR> $\begin{alignedat}{1} <BR>10^1 &= 1 + 9 = 1 + 3\times 3=1+3k_1 \\
<BR>10^2 &= 1 + 99 = 1 + 3\times 33=1+3k_2 \\ <BR>10^3 &= 1 + 999 = 1 +
3\times 333=1+3k_3 <BR>\end{alignedat}$ \\ <BR> \\ \\
<BR>%\hspace*{-5pt} <BR>% <BR>% <BR>% I write \hspace*{-5pt} because the
following line was not in the left margin. <BR>% Is it possible to do this for
example by a setlength like \setlength{\tabcolsep}{0mm} or by other mean ? <BR>%
<BR>% <BR>$\begin{alignedat}{3} <BR>10^1 &= 1 + 9 & \quad 10^1 &= 1
+ 9 & \quad & \text{line 01} \\ <BR>10^2 &= 1 + 99 & \quad 10^2
&= 1 + 99 & \quad & \text{line 02} \\ <BR>10^3 &= 1 + 999 &
\quad 10^3 &= 1 + 999 & \quad & \text{line 03} \\
<BR>\end{alignedat}$ \\ <BR>%\hspace*{-5pt} <BR>% <BR>% <BR>% I write
\hspace*{-5pt} because the following line was not in the left margin. <BR>%
Sorry for my bad english. I hope you understand what i mean. <BR>% Is it
possible to do this for example by a setlength like \setlength{\tabcolsep}{0mm}
or by other mean ? <BR>% <BR>% <BR>$\begin{alignedat}{1} <BR>10^1 &= 1 + 9 =
1 + 3\times 3=1+3k_1 \\ <BR>10^2 &= 1 + 99 = 1 + 3\times 33=1+3k_2 \\
<BR>10^3 &= 1 + 999 = 1 + 3\times 333=1+3k_3 <BR>\end{alignedat}$ \\ <BR>%
<BR>% <BR>% A solution is in the following lines but it's not a regular
solution. <BR>% For one block i can use flalign but the width of the block is
\textwidth so parbox is better. <BR>% <BR>% <BR>\parbox{\widthof{$10^3 = 1 + 999
= 1 + 3\times 333=1+3k_3$}}{\begin{align*} <BR>10^1 &= 1 + 9 = 1 + 3\times
3=1+3k_1 \\ <BR>10^2 &= 1 + 99 = 1 + 3\times 33=1+3k_2 \\ <BR>10^3 &= 1
+ 999 = 1 + 3\times 333=1+3k_3 <BR>\end{align*} } \\ <BR>% <BR>% <BR>% There is
a space before the following line. <BR>% Is it possible to control this space by
a setlength like \setlength{\tabcolsep}{0mm} or by other mean ? <BR>% It'
possible to write \\[-1.5\baselineskip] after begin of flalign but it's not a
regular solution. <BR>% <BR>% <BR>\begin{flalign*} <BR>10^1 &= 1 + 9 = 1 +
3\times 3=1+3k_1 & \\ <BR>10^2 &= 1 + 99 = 1 + 3\times 33=1+3k_2 \\
<BR>10^3 &= 1 + 999 = 1 + 3\times 333=1+3k_3 <BR>\end{flalign*} <BR>% <BR>%
<BR>% There is a space before the following line. <BR>% Is it possible to
control this space by a setlength like \setlength{\tabcolsep}{0mm} or by other
mean ? <BR>% It' possible to write \\[-1.5\baselineskip] after begin of flalign
but it's not a regular solution <BR>% <BR>% <BR>\begin{alignat*}{2} <BR>x& =
y_1-y_2+y_3-y_5+y_8-\dots
<BR> &\quad&
\text{by \eqref{eq:C}}\\ <BR> & = y'\circ y^* && \text{by
\eqref{eq:D}}\\ <BR> & = y(0) y' && \text {by Axiom 1.}
<BR>\end{alignat*} <BR>% <BR>% <BR>% of course two spaces : one for
\end{alignat*} and one for \begin{align} <BR>% Is it possible to control this
<BR>% <BR>% <BR>\begin{align*} <BR>x& = y_1-y_2+y_3-y_5+y_8-\dots
<BR> &\quad&
\text{by \eqref{eq:C}}\\ <BR> & = y'\circ y^* && \text{by
\eqref{eq:D}}\\ <BR> & = y(0) y' && \text {by Axiom 1.}
<BR>\end{align*} <BR>\end{document}
<BR> <BR> <BR> <BR>Germain BOYER, <A
href="mailto: germain.boyer@ac-toulouse.fr">germain.boyer@ac-toulouse.fr</A>
21-09-2009 <BR></DIV></BODY></HTML>