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1.5: Порядок операцій
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\[ \begin{aligned} 6 \cdot 43 = 6 \cdot (40 + 3) ~ & \textcolor{red}{ \text{ Express 43 as a sum: } 43 = 40 + 3} \\ = 6 \cdot 40 + 6 \cdot 3 ~ & \textcolor{red}{ \text{ Distribute the 6.}} \\ = 240 + ...\[ \begin{aligned} 6 \cdot 43 = 6 \cdot (40 + 3) ~ & \textcolor{red}{ \text{ Express 43 as a sum: } 43 = 40 + 3} \\ = 6 \cdot 40 + 6 \cdot 3 ~ & \textcolor{red}{ \text{ Distribute the 6.}} \\ = 240 + 18 ~ & \textcolor{red}{ \text{ Multiply: } 6 \cdot 40 = 240 \text{ and } 6 \cdot 3 = 18.} \\ = 258 ~ & \textcolor{red}{ \text{ Add: } 240 + 18 = 258.} \end{aligned}\nonumber \]