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例 1 某人看到平静的湖面下有一时钟的倒影 ,如图 1所示 ,则此刻的实际时间为 ( ) .(Ａ) 7:15 (Ｂ) 4:45(Ｃ) 1:45 (Ｄ)以上都不正确 错解 从平面镜中看到的时钟 ,推算出实际时间 ,同学们已有两种常见的处理方法 :一是用 12 :0 0减去镜中的读数 ;再就是将卷子翻到背
Example 1 When someone sees a clock reflection under a calm lake, as shown in Figure 1, the actual time at the moment is () (A) 7:15 (B) 4:45 (C) 1:45 (D ) The above are not correctly misunderstood the clock seen from the plane mirror and calculate the actual time. The students have two common methods: one is to subtract the reading from the mirror by 12:0; Back to back