甲乙两车从相距420千米的两地相对开出，5小时后甲车行了四分之三，乙车行了三分之二，求两车相距多少千米？

数学题解答：①甲车离终点还剩下：1 – 3/4 ＝ 1/4，乙离终点还剩下：1 – 2/3 ＝1/3

两车距离占总路程的：1 – 1/4 – 1/3 ＝ 5/12

两车距离：420 × 5/12 ＝ 175（千米）

②或者这样做：3/4 + 2/3 – 1 ＝5/12，420 × 5/12 ＝ 175（千米）

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