如果60m表示“向北走60m”，那么“向南走40m”可以表示为【】A

如果60m表示“向北走60m”，那么“向南走40m”可以表示为【】

A．－20m B．－40m C．20m D．40m

答案

B．

解析:略

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如果60m表示“向北走60m”，那么“向南走40m”可以表示为【 】A

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如果60m表示“向北走60m”，那么“向南走40m”可以表示为【】A