1.
Let \(\displaystyle f(x)=\frac{25^x}{25^x+5}\). Calculate \(\displaystyle f\left(\frac{1}{221}\right)+f\left(\frac{2}{221}\right)+\ldots+f\left(\frac{220}{221}\right)+f\left(\frac{221}{221}\right)=\)
。
我的教甄準備之路 頭尾相加為定值
https://math.pro/db/viewthread.php?tid=661&page=3#pid25489
