推 yusd24 :let u=x^2...then you can find the answer 08/23 17:58
→ yusd24 :沒事...我看錯了orz 08/23 17:59
→ doublewhi :是(1/2)*(x^2)還是1/(2x^2) ? 前者就如樓上 08/23 19:23
→ doublewhi :.......後者也如樓上阿= = 08/23 19:25
→ kane950544 :先令u=(√2)x 應該可以看比較清楚 08/23 19:27
→ raily1151521:恩 我試看看謝謝大家 08/24 14:34