fitness rooms black girl with big booty takes big white cock after workout


yoyobi 1年前 悬赏5滴雨露 已收到1个回答 我来回答 举报

tianari 幼苗

共回答了11个问题采纳率:90.9% 向TA提问 举报

已知函数f(x)= lnx x 的图象为曲线C,函数g(x)= 1 2 ax+b的
图象为直线l. (1)当a=2,b=-3时,求F(x)=f(x)-g(x)的最大值; (2)设直线l与曲线C的交点的横坐标分别为x 1 ,x 2 ,且
x 1 ≠x 2 ,求证:(x 1 +x 2 )g(x 1 +x 2 )>2.


Copyright © 2021 - 雨露学习互助 - 17 q. 0.019 s. -
gorgeous lesbians kiss passionately before licking pussy vrallure busty ebony beauty daizy cooper plays with her sex toys in virtual reality loan4k le banquier est pret a aider une fille si elle donne quelque chose en retour pawg gets her brains fucked out and loves it kinkyinlaws jasmine jae sicilia sexy british step mom hardcore lesbian sex with hot blonde letsdoeit