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数学建模信息网

1. otaka732 2011-12-31 于 11:42 下午

   Midnight tutor… funny thing is, I’m watching this at midnight right now.
2. Westscottchip 2012-01-01 于 12:36 上午

   Great video, thanks for the help.
3. Ghaiyst 2012-01-01 于 1:24 上午

   @k2g2005 Teachers make mistakes a lot. Little errors are not a big deal, especially when he’s not trying to design a structure or something that important. Maybe your brain development, but you can render that through experience. a brain structure can develop with mistakes, but a structure of a building or whatever cant. We all make mistakes and can learn from them. When a building collapses, thats the end of it.
4. jonnyrebel00 2012-01-01 于 1:35 上午

   Loved the video, wish it was a little easier to see what you wrote.
5. Kridge2011 2012-01-01 于 1:44 上午

   You’re really annoying… And not to mention incorrect. Thanks for the confusion!
6. marlinheck 2012-01-01 于 1:47 上午

   @jpcme2002 Be aure to use a GOOD ink marker, possibly NEW, for you videos. Much of your work was not well visible. As, write larger. Even at full screen, your writing was small. (PS. I’ve been teaching for 42 years.) Oh, and I do remember the formula for area of trapezoid. It’s required for all students in Maryland from fifth grade on up. Since I’ve taught from fifth to 12th, I remember it.
7. marlinheck 2012-01-01 于 2:02 上午

   @jpcme2002 Be aure to use a GOOD ink marker, possibly NEW, for you videos. Much of your work was not well visible. As, write larger. Even at full screen, your writing was small. (PS. I’ve been teaching for 42 years.)
8. postal83 2012-01-01 于 2:08 上午

   you kidding me people lol… my college teacher makes several mistakes in class, but most people don’t see them because it’s the concept that matters… elementary algebraic mistakes are something you can throw out the window. Watching this has helped reinforce my understanding of Riemanns Sum, not how to add numbers.
9. leet512 2012-01-01 于 2:43 上午

   ya i think these videos are excellent and shouldn’t be written off due to a few numerical errors… teaching high-level math is more about getting across concepts and methods in an understandable way rather than being perfect at numbers

   numerical accuracy is more important when math is applied in life… and in most such projects there is already an established safety net of peer review and hawk-eyed computers that spot those minor errors… so getting upset over them is a bit over the top
10. k2g2005 2012-01-01 于 2:53 上午

    @maj10311982 i know it drove me crazy -.- i was like ITS 30 U SHOULDNT BE TEACHING IF U CANT ADD!!!!!
11. AnkitOverkill 2012-01-01 于 3:38 上午

    hey thanks a lot for the tutorial, it helped a lot! ignore all the idiots trolling on about the mistake you made , silly mistakes happen to everyone.
12. AvidLearner11 2012-01-01 于 4:02 上午

    It looks like you’re feeling awkward trying to turn toward us while doing the problem. Be on the right side instead so you can write with your right hand and turn to us from the left.
13. Ironliquor 2012-01-01 于 4:36 上午

    Thanks for all the help. It was really quite useful. You’re a great teacher!
14. DarcPrince 2012-01-01 于 5:19 上午

    if you have an equation with inconstant curve ] a=0, b=5 – so n (the amount of subdivisions) = 5, therefore when you are trying to find the Upper Sum, it would be the highest point within that one subdivision, if the next one has a higher point in the left side than you would take the division from that point, and the same for the Lower Sum, but the opposite, taking from the lowest point within that subdivision.
15. Vaminos413 2012-01-01 于 5:28 上午

    This video helped clear up Reimann sums, thanks!
16. Ironkiller22 2012-01-01 于 5:34 上午

    I´ve been reading Spivak´s Calculus and i don´t get what does mean U(f,P)-L(f,P)
17. SpareNoOne 2012-01-01 于 6:30 上午

    Very Helpful thank u
18. novatodeguitarra 2012-01-01 于 7:05 上午

    1+4+9+16=30 just do (1+9) + (16+4) my adivice to you people when adding a lot of numbers please make yourself a favour and join the “tens”
19. vaunstone89 2012-01-01 于 7:16 上午

    totally cool….loved it
    keep the good work going
20. moha9 2012-01-01 于 7:25 上午

    thank u so much i had trouble with the midpoint but after watch ur video i totally get it
21. dominicfhk 2012-01-01 于 8:07 上午

    This video is very helpful. Thanks!!
22. maj10311982 2012-01-01 于 8:31 上午

    You know all can commit mistakes or wrong answers, but the most important is how you compute the math problem in the right method.
23. gmsherry1953 2012-01-01 于 9:01 上午

    Maj and Shooter are both right. The left method answer is 30 not 29, and the right method answer is 55 not 54 (same mistake both times, ignoring the initial 1). Also, it’s absurd to figure the area of trapezoids by breaking them into rectangles and triangles when a simple formula exists to find it directly , 0.5(h1+h2)b. I’m sure the presenter meant to be helpful, but this video might mislead the very people he means to help. They deserve better.
24. DarkZea1ot 2012-01-01 于 9:34 上午

    if you are just trying to find an integral, yes, but on some test questions, they might ask you specifically to do a riemann sum
25. superflex007 2012-01-01 于 10:28 上午

    besides you are normally given more complicated functions for which you wont draw during your exam

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