Brug Mix (reeks 1)

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\(74 + 11 = \ldots\)

\(\begin{align} & 74 + 11\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)