\[ \large \frac{ \color{green}{1234} \times \color{blue}{9876} -\color{green}{1234} \times \color{red}{5432}} { \color{blue}{9876} - \color{red}{5432} } . \]
根據分配律,題目可化簡為
\[ \large \frac{ \color{green}{1234} \times ( \color{blue}{9876} - \color{red}{5432})} { \color{blue}{9876} - \color{red}{5432} } . \]
將分子與分母的
\[ \large \color{blue}{9876} - \color{red}{5432} \]
消去得到答案
\[ \large \color{green}{1234} \]
練習題: \[ \large 1234 \times 357 + 1234 \times 643 \] 答案為多少呢?
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