Développer et simplifier les expressions suivantes.
\begin{multicols}{2}
    \begin{parts}
        \Block{set e = Expression.random("_*(_*x + _)")}
        \part $A = \Var{e}$
        \begin{solution}
            \begin{eqnarray*}
                \Var{e.simplify().explain() | calculus(name = "A")}
            \end{eqnarray*}
        \end{solution}

        \Block{set e = Expression.random("_*x(_*x + _)")}
        \part $B = \Var{e}$
        \begin{solution}
            \begin{eqnarray*}
                \Var{e.simplify().explain() | calculus(name = "B")}
            \end{eqnarray*}
        \end{solution}

        \Block{set e = Expression.random("(_*x+_)(_*x + _)", val_min = 2)}
        \part $C = \Var{e}$
        \begin{solution}
            \begin{eqnarray*}
                \Var{e.simplify().explain() | calculus(name = "C")}
            \end{eqnarray*}
        \end{solution}

        \Block{set e = Expression.random("(_*x + _)^2", val_min = 2)}
        \part $D = \Var{e}$
        \begin{solution}
            \begin{eqnarray*}
                \Var{e.simplify().explain() | calculus(name = "D")}
            \end{eqnarray*}
        \end{solution}
    \end{parts}
\end{multicols}