def construction(a):
    question = u"Réduire :"
    exo = [ ]
    cor = [ ]
    solve = [a]
    exo.append("$$A = %s$$" %texify(solve)[0])
    cor.append("\\begin{center}")
    cor.append("$\\begin{aligned}")
    cor.append("A & = %s \\\\" %texify(solve)[0])
    solve = priorites(a)
    solve.insert(0, a)
    solve = texify(solve)
    if len(solve)>1:
        for e in solve[1:]:
            if e == solve[-1]:
                cor.append("A & = \\boxed{%s} \\\\" %e)
            else:
                cor.append("A & = %s \\\\" %e)
    cor.append("\\end{aligned}$")
    cor.append("\\end{center}")
    return (exo, cor,question)
def reduire(parametre):
    """Travail sur les bases du calcul littéral en quatrième"""
    question = ""
    exo = [u"Réduire, si possible, les expressions suivantes :",
           "\\begin{multicols}{3}\\noindent", "  \\begin{enumerate}"]
    cor = [u"Réduire, si possible, les expressions suivantes :",
           "\\begin{multicols}{3}\\noindent", "  \\begin{enumerate}"]
    for i in range(9):
        a = valeurs_reduire()
        solve = [a]
        exo.append("\\item $\\thenocalcul = " + texify(solve)[0] + "$")
        cor.append("\\item $\\thenocalcul = " + texify(solve)[0] + "$")
        solve = priorites(a)
        solve.insert(0, a)
        solve = texify(solve)
        if len(solve)>1:
            for e in solve[1:]:
                cor.append("\\[\\thenocalcul = "  + e + "\\]")
        exo.append("\\stepcounter{nocalcul}")
        cor.append("\\stepcounter{nocalcul}")
    exo.extend(["  \\end{enumerate}", "\\end{multicols}"])
    cor.extend(["  \\end{enumerate}", "\\end{multicols}"])
    return (exo, cor, question)