Pornhub logo






© Pornhub.com, 2025
RTA
English

You are now leaving Pornhub.com

NO MORE ADS.
JUST ALL THE PREMIUM
PORN YOU CAN HANDLE WELCOME TO
THE BEST PORN
EXPERIENCE. EVER. FINALLY,
THE PORN EXPERIENCE
YOU DESERVE.
No Ads
Exclusive
Content
High Quality
HD
Cancel
Anytime

Offering exclusive content not available on Pornhub.com. Super affordable at only €9.99/month.

Start Free Week of Pornhub Premium
Go Back

You are now leaving Pornhub.com

Free 7 day
premium
access

No Ads + Exclusive Content + HD Videos + Cancel Anytime

Start now

Watch this exclusive
video only on
pornhub premium.

Luckily you can have FREE 7 day access!

Watch this hd video now

You will never
see ads again!

Claim your 7 day free access

Watch this 1080p
video only on
pornhub premium.

Luckily you can have FREE 7 day access!

Watch this hd video now

By upgrading today,
you get one week
free access

No Ads + Exclusive Content + HD Videos + Cancel Anytime

Claim your 7 day free access

Offering exclusive content not available on Pornhub.com

Video poster
Resume

订阅【changhsumath666】不是 changhsumath！一起创造首个 P 站排名前十的华人频道！【张旭版妹微积分】板妹 instagram：norah2.14

72.7K Views
78%
2 years ago
Add to
Report
Share
108
29
43
Added to your Favorites
Add to playlist
Add to stream
Login or Sign Up now to add this video!
Login or Sign Up now to add this video to stream!
Close
Jump to your favorite action
      Close
      avatar
      changhsumath666
      148 Videos 9.5K Subscribers

      Categories 

      HD Porn SFW Verified Amateurs
      Suggest
      Vote on categories
      • HD Porn
      • SFW
      • Verified Amateurs
        Submit

        Pornstars 

        Suggest
        Thank you for your suggestions! Our team is reviewing them!

        Tags

        張旭 數學 微積分 老師 板妹 枝枝 校園 big boobs
        Suggest
        Vote on tags
        • 張旭
        • 數學
        • 微積分
        • 老師
        • 板妹
        • 枝枝
        • 校園
        • Big boobs
        Submit

        Model Attributes

        Black Hair No Piercing Asian Tattoos

        Production 

        homemade
        Suggest

        Language Spoken 

        chinese
        Vote on production
        • Professional
        • Homemade
        Added on 2 years ago
        View more

          All Comments (12)

          Login or Sign Up now to post a comment!

          talker93
          talker93
          2 years ago
          请问下老师，有没有可能求出多个极值点的情况？另外限制条件的数量跟极值点数量有没有什么关系？是不是限制条件越多极值点越多？
          20
          • Reply
          jarvaniiii3
          jarvaniiii3
          1 year ago
          完全有可能求出多个极值点的情况，这种题解法原理就是让未知数偏导全为零，这样得到的点有一个算一个全是极值点，最后一般问的是确定最大值，就带这几个数回原式比较就行。另外你问的限制条件数量，其实就是在原式后面加上这个限制条件再多几次求微分，与所得结果数量并没有什么必然联系
          0
          • Reply
          suzihua
          suzihua
          1 year ago
          真学起来了呀兄弟
          1
          • Reply
          Sur8eDiCK
          Sur8eDiCK
          2 years ago
          逆天
          2
          • Reply
          yoyo56712
          yoyo56712
          2 years ago
          恭喜你解锁新成就：我在P站学数学
          1
          • Reply
          fssxsex
          fssxsex
          2 years ago
          ?
          1
          • Reply
          690733752QQ
          690733752QQ
          1 year ago
          ???
          0
          • Reply
          Gnorwman
          Gnorwman
          2 years ago
          板妹有在乱擦板书哦~
          0
          • Reply
          MiskuZero
          MiskuZero
          2 years ago
          别卷了
          0
          • Reply

          The World's Biggest XXX Porno Tube

          Pornhub provides you with unlimited free porn videos with the hottest adult pornstars. Enjoy the largest amateur porn community on the net as well as full-length scenes from the top XXX studios. We update our porn videos daily to ensure you always get the best quality sex movies.

          © Pornhub.com, 2025
          RTA
          Pornhub logo

          This website is only intended for users over the age of 18.