推 satsuki93100: 1.廣義柯西 04/14 17:26
→ satsuki93100: 2.三倍角 04/14 17:26
→ satsuki93100: 3.考慮F(x)=xf(x)-1=a(x-1)(x-2)...(x-2019) 04/14 17:29
推 satsuki93100: X=0帶入得到F(x)=-1=a(-2019!) 得到a=-1/2019! 04/14 17:31
→ satsuki93100: 再代入題目所求 04/14 17:31
→ satsuki93100: 4.z=2(coa x+isinx)下去換. 人在外只能先這樣回覆 04/14 17:32
→ satsuki93100: 見諒一下 04/14 17:32
→ satsuki93100: 更正:a=1/2019!才對 04/14 17:33
→ baba1234 : (1)(2)題還是想不出,能否請高人詳細解答,感謝。 04/16 10:00
→ baba1234 : 漂亮的解法!~3Q~ 04/16 22:53