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/ 则 $15t = 900$ 米,
则 $15t = 900$ 米,
February 22, 2026
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#### 77.14### 高等045:计算题
行进次数为 $2 \times 15 = 30$ 次(前后两次/搬运一次),
若速度恒定,且每次搬运耗时相同,设每次耗时 $t$ 秒,
所以耗时 $t = 60$ 秒。
机器人单程速度为 **1 米/秒**。
### 高等055:概率题
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