2021-II-02 Posted on 28-06-2023 By app.cch 在〈2021-II-02〉中尚無留言 答案:C $\begin{array}{rcl} m(m-a) & = & a(1-m) \\ m^2 -am & = & a -am \\ a & = & m^2 \end{array}$ Same Topic: 2018-I-01 2019-I-01 2021-I-02 2023-I-01 2021, 卷二, 香港中學文憑-數學 Tags:主項變換