Brug Mix (reeks 1)

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\(68 + 20 = \ldots\)

\(\begin{align} & 68 + 20\\= &20+68\\= &20 + \color{green}{60} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)