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Completer les pointillets
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\begin{multicols}{2}
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\begin{parts}
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\part $15 +\quad \cdots \quad = 21 + 12$
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\part $3 \times 6 = \quad \cdots \quad + 5$
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\part $\quad \cdots \quad - 5 = 4 \times 21$
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\part $ 5 - 8 = 2 - \quad \cdots \quad$
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\end{parts}
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\end{multicols}
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