✨ 最佳解答 ✨
(k+1)x +ky = 2
x = 2 / k+1
y = 2 / k
與 X軸和 Y軸的交點分別為 (2 / k+1 , 0) (0 , 2 / k)
面積 = 1/2 * 2 / k+1 * 2 / k
= 2 / k(k +1)
Σ 2 / k(k +1)
= 2 Σ 1 / k(k +1)
= 2* (1/ 1*2 + 1/ 2*3 + 1/ 3*4 + ... + 1/ 2016*2017)
= 2* (1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/2016 - 1/2017)
= 2* (1 - 1/2017)
= 2* 2016/2017
= 4032/2017
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