a)  Phép chiếu vuông góc lên đường thẳng $d$ có phải là một phép dời hình không?
b)  Phép tịnh tiến theo vectơ $\overrightarrow {u}$ có phải là một phép dời hình không?
c)  Phép đồng nhất có phải là một phép dời hình không?
cần giải chi tiết

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