Let d (x, y) (x >; 0)
Because the distance between d and m and y axis is equal.
So M(-x, 0)
Because 2OM = on
So N(2x, 0)
Because FN//DG
Therefore, the triangular MFN is similar to the Millennium Development Goals. The triangle OEN and ODG are similar.
So MF/FD=MN/NG
NG/GO=DE/DO
Because MF=FD
So NG=3x OG=ON+NG=5x.
So DE/DO=3/5.
Because the height of three DMOs and the ratio of three DFEs are 5:3, and the ratio of the bottom is 2: 1.
So three MDOs: three DEFs =10: 3.
Because m, d and n are in y =-x 2+bx+c.
So-x 2-bx+c = 0 ...
So y =-x 2+bx+c = 2bx. ...
-4x^2+2bx+c=0...& lt3 & gt
Because s three DEF= 12/5
So s 3 DMO =1/2 * x * y =10/3 *12/5 = 8.
& lt2> when y=2bx is replaced, x 2 = 8/b.
Daihui < 1 >& lt2>& lt3>
The solution is x=2 b=2 c=8.
So d (2,8)