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歡迎您訪問數學考題練習:小明照鏡子的時候,發現衣服上的數字在鏡子中呈現!

數學考題練習:小明照鏡子的時候,發現衣服上的數字在鏡子中呈現

更新時間:2024-01-12 14:03:15作者:貝語網校

小明照鏡子的時候,發現衣服上的數字在鏡子中呈現“”的樣子,請你判斷這個數字是

A.52

B.25

C.22

D.32

試題答案

A

試題解析

關于鏡子的像,實際數字與原來的數字關于豎直的線對稱,根據相應數字的對稱性可得實際數字.

解答:∵是從鏡子中看,

∴對稱軸為豎直方向的直線,

∵5的對稱數字為2,2的對稱數字是5,

即|

∴實際數字為52,

故選A.

點評:考查鏡面對稱,得到相應的對稱軸是解決本題的關鍵;若是豎直方向的對稱軸,數的順序正好相反,注意2的對稱數字為5,5的對稱數字是2.

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