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1. ### Prob & expected value (40分!!)

... well, it wouldn't be a hard one. 5) Case 1: go home to get umbrella, and then take taxi back to work Case 2: go to work directly Case 1 EV=1*(-60)=-60 ...

分類：科學及數學 > 數學 2015年04月23日

2. ### how to do hw faster?

... is behind you. Have a snack and take a break for supper. Work steadily during the day and get to bed at a reasonable time to keep your mind sharp.

分類：科學及數學 > 數學 2017年04月18日

3. ### surface integral & surface area

... and you know the way to work out the area of each surface. e.g. a sphere...curve(plane). In this case, you need to know the regions of the S...differentiate r with respect to u and v and we get ru and rv |ru x rv| is a parallelogram...

分類：科學及數學 > 數學 2007年04月18日

4. ### directional derivatives I

Please check if your question or answer for (ii) has any mistake? 2010-11-13 21:38:01 補充： I see, I wrongly interpret (1,1,0) as a vector!!! 2010-11-13 21:49:13 補充： ======================================================= 圖片參考：http://img811.imageshack.us/img811/6533/55103050.png 2010...

分類：科學及數學 > 數學 2010年11月14日

5. ### How to improve maths ?

...do not turn the page and tackle the next topic. If you do, you will get even more frustrated and you in all likelihood will begin to give up hope. 2) Work example problems and check your answers to gain practice...

分類：科學及數學 > 數學 2016年07月14日

6. ### Find the distance?

The answer should be 5. Consider a line y = -3, it passes through (-1,-3) The distance between y = -3 and y = 2 is (2-(-3)) = 5

分類：科學及數學 > 數學 2007年03月14日

7. ### Geometric optimzation problems

...x-3.5)(y-1.8)Set y=1.5x as usal for the print work .Thus 0=1.5x^2-7.05x-173.7 => x=13.365"...per hour , where along the beach should she land so that she may get to Bob in the least amount of time ? Distance...

分類：科學及數學 > 數學 2013年02月15日

8. ### System of equation

...equation could be solve by graphing, substitution, and elimination. When you get an order pair, you put the number in the equations to see if it works or not. If it works , it is a solution. When you get something...

分類：科學及數學 > 數學 2009年02月19日

9. ### Interesting Maths 2008

...;(k=1 to ∞) kr^(k-1)=1/(1-r)^2 multiply r both side and we get Σ(k=1 to ∞) kr^k=r/(1-r)^2 repeat the same process, we finally get Σ(k=1...

分類：科學及數學 > 數學 2008年11月28日

10. ### How to solve this problem?

Interesting question! You can work out from this: As both numbers are 5-digit... must be 8. By logical deduction like this, you will get the answer. 2010-03-14 23:36:17 補充： And the answer...

分類：科學及數學 > 數學 2010年03月15日

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1. ### 相關詞

 get to work意思