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“蚂蚁行迹”的问题,可以转化为平面内的问题.例1如图1所示,ABCD—A′B′C′D′是一个长方体,且AA′=30厘米,AB=50厘米,BC=40厘米.在A处有一只蚂蚁,它想吃到C′处的食
The problem of the “antile trail” can be transformed into a problem within the plane. Example 1 As shown in Figure 1, ABCD-A’B’C’D’ is a cuboid, and AA’ = 30 cm, AB = 50 cm BC=40 cm. There is an ant at A. It wants to eat at C’.