1題中3數學題!唔識做!help!

2008-05-27 12:55 am
http://i305.photobucket.com/albums/nn239/freemanlau15/12.jpg?t=1211792002

link入面有條數唔識做!!
help

詳細!!!!

回答 (2)

2008-05-27 1:09 am
✔ 最佳答案
Is ABCD a square?

2008-05-26 17:18:50 補充:
if yes,

2x-1 = 2y +1
i.e., x-y=1 ---- *

and
(2x-1)^2 + (2y+1)^2 = ( 開方18)^2
s.t.., 4x^2 - 4x + 4y^2 + 4y + 2 =18
i.e., x^2 - x + y^2 + y = 4 ---- **

sub * into **: (y+1)^2 - (y+1) + y^2 + y =4
y^2 + y - 2 = 0
y= 1 or y= -2(rejected)
so, x= 2
Thus, x=2 and y=1
2008-05-27 4:58 am
ABCD is a a square


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