行きは時速30km、帰りは時速50kmで往復。この車の平均時速は？「時速40km」は間違いです [969416932]
2024/12/31 16:45
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2025/08/12 05:30
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![行きは時速30km、帰りは時速50kmで往復。この車の平均時速は？「時速40km」は間違いです [969416932]](http://matome-ch.com/image/8/8070208.jpg)
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