长方形场地,80米 乘 60米.
Bob跑对角,以9米/秒的速度跑.
求跑完全程的时间.
(80 x 80 + 60 x 60) 然后求平方根
答案 除以 9
一道英语数学题不是很理解Bob runs diagonally across from one corner of a
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