Mathematics, 28.09.2021 15:30 Bekks
Chứng minh rằng, nếu phép afin f biến mỗi đường thẳng a thành đường thẳng a’ song song hoặc trùng với a thì f là phép tịnh tiến hoặc là phép vị tự.
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Chứng minh rằng, nếu phép afin f biến mỗi đường thẳng a thành đường thẳng a’ song song hoặc trùng vớ...
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