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发表于 26-11-2009 03:16 PM
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原帖由 harry_lim 于 26-11-2009 03:06 PM 发表
那個file hor封面是寫什么的?
有寫到我的angka giliran還是什么的嗎?
我沒注意看
好像是写kod kertas而已 |
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发表于 26-11-2009 03:20 PM
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发表于 26-11-2009 04:40 PM
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the roots of the equation x^2+px+q=0 differ by 4√5 and the sum of the squares of the roots is 58.Find p & q.
有人可以教我做吗?? |
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发表于 26-11-2009 05:09 PM
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发表于 26-11-2009 05:18 PM
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sum of root : a+b = -p
product of root : ab =q
and it is given
a-b =4√5
a² + b² = 58
(a-b)² = (4√5)²
a²+b² -2ab = 80
a² + b² = 80+2ab
hence, 80+2ab = 58
2ab = -22
ab = -11
q = -11
a² + b² = (a + b)² - 2ab
(a + b)² = a² + b² +2ab
(a + b)² = 58 +2(-11)
(a + b)² = 36
a + b = 6 or -6
-p = 6 or -6
p = 6 or -6 |
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发表于 2-12-2009 10:26 PM
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今年的paper 1很可恶!
没有出partial fraction,binomial expansion等等常出的题目! |
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发表于 2-12-2009 10:41 PM
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发表于 2-12-2009 10:48 PM
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回复 607# harry_lim 的帖子
听说MATHS T PAPER 2 很惨,跟MATHS S/T PAPER1比较的话,所以PAPER 1应该是OK的吧。 |
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发表于 3-12-2009 12:49 AM
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不用听说,简直是惨不忍睹。。 |
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发表于 3-12-2009 11:49 AM
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发表于 3-12-2009 01:09 PM
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回复 610# harry_lim 的帖子
MATHS T PAPER2今年没GRAPH,
MATHS S PAPER 2 有 5 个GRAPH.. |
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发表于 3-12-2009 01:13 PM
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发表于 3-12-2009 01:36 PM
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发表于 3-12-2009 01:53 PM
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发表于 6-12-2009 12:16 AM
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回复 612# harry_lim
ya lo ..is positive skewness... |
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发表于 7-12-2009 03:48 PM
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本帖最后由 lonely_world 于 8-12-2009 04:23 PM 编辑
show that the equation f(x)=(k+1)x^2+(2k+3)x+(k+2)=0 has real roots for all real values of k. find the set of values of k for which
(a) f(x)=0 is a quadratic equation.
(b) f(x)=0 has one positive & one negative real roots.
Sketch the graph of f(x)=(k+1)x^2+(2k+3)x+(k+2) for k=-1 1/2. |
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发表于 7-12-2009 04:35 PM
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各位,我想问问有什么math的exercise book介绍
我只有补习的exercise而已 而且不太会
想做多点练习 |
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发表于 7-12-2009 06:09 PM
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本帖最后由 idontwant2b 于 7-12-2009 06:11 PM 编辑
show that the equation f(x)=(k+1)x2+(2k+3)x+(k+2)=0 has real roots for all real values of k. fi ...
lonely_world 发表于 7-12-2009 03:48 PM
find b^2 -4ac ,
u get 1, since b^2- 4ac >0, the function is real for all value of k.
a) ur question is in the big question. u sure it is correct?
b) not sure
等有好心人来帮你吧 |
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发表于 8-12-2009 12:03 AM
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回复 616# lonely_world
X sup 2 是 X square 还是 X2 (2 is smaller den X) |
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发表于 9-12-2009 07:04 PM
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回复 lonely_world
X sup 2 是 X square 还是 X2 (2 is smaller den X)
walrein_lim88 发表于 8-12-2009 12:03 AM
是代码来的,square的意思。
solution here.
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