Brug Mix (reeks 2)

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\(45 + 33 = \ldots\)

\(\begin{align} & 45 + 33\\= & \color{green}{40} + \color{red}{5} + \color{green}{30} + \color{red}{3} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)