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【纪念当年的帖子（2010）】Add Maths功课讨论区
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发表于 12-8-2011 04:20 PM
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发表于 17-8-2011 11:19 PM
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the sum of the first hundred terms of an ap with first term a and common difference d is T . The sum ...
josser 发表于 10-8-2011 10:48 PM 
Josser请问你这题怎么做的？我不会做叻... |
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发表于 19-8-2011 07:44 PM
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回复 862# 睡星
AP: a (odd no) , a+d (even no) , a+2d (odd no) .....
r of odd-numbered = 2d
S100 = 100/2 ( 2a + 99d )
T = 100a + 4950d
S50 = (1/2)T - 1000 = 50/2 (2a + 49(2d))
(1/2)(100a + 4950d) - 1000 = 50a + 2450d
50a + 2475d - 1000 = 50a + 2450d
25d = 10000
d = 40 |
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发表于 19-8-2011 08:01 PM
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the cross section of a hollow cone and a circular cylinder. the cone has radius 6cm n height 12cm , and the cylinder has radius r cm and height h cm . the cylinder just fits inside the cone with all of its upper edge touching the surface of the cone.
Express h in terms of r and hence show that the volume ,V cm^3, of the cylinder is given by
V = 12π r^2 - 2π r^3 |
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发表于 20-8-2011 12:08 AM
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sketch for 0 < x < 360 , the graph of y=sin ( x+ 30 ) |
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发表于 20-8-2011 11:24 PM
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回复 864# josser
请问有图画吗？我想象不到做不到== |
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发表于 22-8-2011 01:02 AM
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the cross section of a hollow cone and a circular cylinder. the cone has radius 6cm n height 12cm , ...
josser 发表于 19-8-2011 08:01 PM
h=12-2r. then use V = pie r^2 h, h = V/ (pie r^2) and sub this into 1st equation u will show the equation.我有用到一点中六的方法做的...不知道能不能接受... |
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发表于 23-8-2011 12:03 AM
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回复 867# 睡星
其实这是 a level 问题。。。 应该可以接受 ：） 谢啦 |
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发表于 24-8-2011 05:36 PM
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find the area of the region enclosed by the curve y = (x^2) - 2 and the line y = 2x + 1 |
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发表于 24-8-2011 08:47 PM
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show, by integration. that the area of the region enclosed by the curves y=surd x and y= 2 (surd x )^3 is surd2/15. |
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发表于 5-9-2011 12:52 PM
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show, by integration. that the area of the region enclosed by the curves y=surd x and y= 2 (surd x ...
josser 发表于 24-8-2011 08:47 PM
这个我的答案是 (surd 1/2)（2/15）哦！怎样做到你哪个答案？ |
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发表于 5-9-2011 12:55 PM
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find the area of the region enclosed by the curve y = (x^2) - 2 and the line y = 2x + 1
josser 发表于 24-8-2011 05:36 PM
答案是4 2/3 cm2 吗？这题看起来简单，内里有乾坤 ，如果错的话就不好意思咯～ |
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发表于 8-9-2011 01:59 PM
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本帖最后由 baby5194 于 8-9-2011 02:00 PM 编辑
各位好，
我妹妹的addmath每次都不及格，现在正进行恶补。。。请问我应该怎么样开始呢？要从哪一课开始？？因为我对现在的考试格式不是很清楚，距离spm也只剩两个月了。。。 |
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发表于 9-9-2011 06:46 PM
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show tat the points (7,12) , (-3,-12) and (14,-5) lie on a circle with centre (2,0). |
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发表于 9-9-2011 09:07 PM
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b和d怎樣做？ |
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发表于 12-9-2011 06:37 PM
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b和d怎樣做？
jose 发表于 9-9-2011 09:07 PM 
(b) PM = PA + AM
= -1/3 b + a
(d) BC = BA + AC
= -3a + b |
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发表于 19-9-2011 03:38 PM
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 囧囧乃问问鸟
probabilty有谁可以skype教囧囧？ |
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发表于 4-11-2011 01:14 PM
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啊啊~~ 我有问题，帮帮忙。
题目：
The sixth term of an arthmetic progression is 265 and the sum of the first five terms is 1445.
Find the number of the terms that must be taken for their sum to begin with a negative value. |
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发表于 9-11-2011 02:12 AM
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发表于 8-12-2011 01:24 PM
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十万火急，赶着救命！救救我啊~
the sum of the first nine terms of an arithmetic progression is 81 and the sum of the first 17 terms is 289. find the sum of the first n terms of the progression~求解答 |
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