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2022-04-17 14:15 作者:小北海龙王挖矿 0人读过 | 我要投稿

我有几道题目不会做，麻烦大家予以解答：

求 $%5Clog_%7B10%7D%20%5Cleft(%20%5Ccos%5E%7B%5Cfrac%7B%5Cln%202%7D%7B%5Clog_%7B2%7D%20%5Cmathrm%7Bi%7D%20%7D%20%7D%20%5Cpi%20%5Cright)%20%20$
求 $%5Ccos%20%5Cfrac%7B%5Cpi%7D%7B17%7D$ 的值
求 $%5Ccos%20%5Cfrac%7B%5Cpi%7D%7B19%7D$ 的值
已知 $%5Csin%20x%5Cneq%20%5Ccos%20x$ 且 $%5Csin%20x%2B%5Ctan%20x%3D%5Ctan%20%5Cleft(%20%5Ccos%20x%5Cright)%20%20(x%3E0)$ 。求 $x%5E%7B%5Cln%20x%7D$ 的值
在复数范围内解方程组 $%5Cbegin%7Bcases%7D%5Ccos%20x%3D%5Ctan%20y%26%5Ctext%7B%E2%91%A0%7D%20%5C%5C%20x%5E%7B49%7D-y%5E%7B49%7D%3D1%26%5Ctext%7B%E2%91%A1%7D%20%5C%5C%20%5Ctan%20x-%5Csin%20%5Cleft(%20%5Ccos%20y%5Cright)%20%20%2B%5Ctan%20xy%3D0%26%5Ctext%7B%E2%91%A2%7D%20%5Cend%7Bcases%7D%20$
解这些复系数方程： $%5Cbegin%7Bcases%7D1.%26ax%5E%7B49%7D%2Bbx%5E%7B48%7D%2Bcx%5E%7B47%7D-dx%5E%7B46%7D%3D0%5Cleft(%20a%5Cneq%200%5Cright)%20%20%5C%5C%202.%26ax%5E%7B48%7D-bx%5E%7B101%7D%3D0%5Cleft(%20b%5Cneq%200%5Cright)%20%20%5C%5C%203.%26x%5E%7Bab%7D-ax%5E%7Bb%7D%2Bbx%5E%7B%7B%7Da%7D%3Da-b%5Cleft(%20a%2Bb%5Cneq%200%5Cright)%20%20%5Cend%7Bcases%7D%20$
试叙述计算尺的使用方法