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发表于 21-1-2006 02:44 AM
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发表于 22-1-2006 01:45 AM
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sawahti krup......phom yak rian pra-sa thai,son pra-sa thai dai mai?
khop khun krup la gon.... |
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发表于 22-1-2006 02:24 AM
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发表于 22-1-2006 08:52 AM
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发表于 22-1-2006 08:59 AM
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发表于 22-1-2006 02:39 PM
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发表于 22-1-2006 06:18 PM
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发表于 22-1-2006 10:55 PM
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wa dee jao..........
haha.."i think i"..很好听的歌哦。。。
有人有这首歌吗？？ |
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楼主 |
发表于 23-1-2006 04:38 PM
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dugong,我不会做的数学都在这里了，尽快帮我解答。
1.
The co-ordinates of P,Q,R, the vertices of the triangle PQR,are(1,1),(5,4),(4,0).if the altitude through P meets QR in X,find
(a)the equation of PX
(b)the co-ordinate of X
(c)the length PX
2.
The co-ordinate of the vertices of a triangle are (0,4),(2,0),(4,2).
Prove that the triangle is isosceles and find its area.
3.
Find the equation of the lines passing through the point A(3,4),and (i)parallel,(ii)perpendicular to the line 4x+3y=8.If these lines meet the line 2x+y=1 in points B and C,find the area of triangleABC.
4.
The co-ordinate of the pointA,B,C are (-3,-1),(11,13),(-1,-3),find the equation of the sides AB and BC.Deduce the co-ordinates of the centre
of the circumcircle of the triangle.
5.
Find the radius and centre of the circumcircle of the triangle whose
vertices are (-1,8),(-1,-2),(2,4) .
6.
Prove that the quadrilateral whose vertices are (1,3),(1,-1),(3,1),
(-1,1)is cyclic.
7.
Show that the points (1,3),(3,4),(4,-3)are three vertices of a triangle and find the co-ordinate of the fourth vertex.
8.
Find the points of intersection of the line y=x-2 and the curve
y2(y square)=4x.Write down the equation of the perpendicular bisector
of the line joining these points and find where it meets the axis of x.
9.
Find the points of intersection of the curve x2+y2+10(x+y)+25=0 with
the co-ordinate axes.Explain the result.
就这9题，如果可以的话，请用英文回答
用华文也可以。thanks... |
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楼主 |
发表于 23-1-2006 04:39 PM
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楼主 |
发表于 23-1-2006 04:43 PM
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楼主 |
发表于 23-1-2006 05:08 PM
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原帖由 siokae0422 于 9-1-2006 05:55 PM 发表
哈哈，我也来。。。。。。
有dugong的出现我也要出现！
有你出现的地方，我也会出现。哈哈 |
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楼主 |
发表于 23-1-2006 05:10 PM
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楼主 |
发表于 23-1-2006 05:13 PM
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原帖由 dugong 于 12-1-2006 07:25 PM 发表
来顶一下。。针对你们楼上的话题，应该先问Khun Akaki一下哦。。
问我什么？？跟我有关？？ |
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楼主 |
发表于 23-1-2006 05:17 PM
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楼主 |
发表于 23-1-2006 05:18 PM
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原帖由 chucky 于 13-1-2006 11:40 PM 发表
sa wa dee jao........
很久没来了。。。
大家碜样了。。？
哦。。。欢迎你回来～～ |
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楼主 |
发表于 23-1-2006 05:20 PM
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楼主 |
发表于 23-1-2006 05:23 PM
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楼主 |
发表于 23-1-2006 05:28 PM
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发表于 23-1-2006 06:10 PM
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1.
The co-ordinates of P,Q,R, the vertices of the triangle PQR,are(1,1),(5,4),(4,0).if the altitude through P meets QR in X,find
(a)the equation of PX
(b)the co-ordinate of X
(c)the length PX
Solution
(a)Q and R->(5,4)(4,0)=(x1,y1)(x2,y2)
Standard Formula: (x1-x2)/(y1-y2)=(x-x1)/(y-y1)
Sub-in coordinates of Q and R: (5-4)/(4-0)=(x-5)/(y-4)
1/4=(x-5)/(y-4)
(1/4)(y-4)=x-5
1/4y-1=x-5
y=4(x-4)
y=4x-16-->Equation of PX (general form is y=mx+c)
(b) coordinate of X (x,1) --> given that y=1, to find x.
sub in equation from part (a)
y=4x-16
1=4x-16
4x=17
x=4.25
(c)忘记了oops~
Khun Akaki，我的中学是酱教的。不知道跟你的学校一样吗？一题一题来～ |
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，所以。。。哈哈
1974 
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