Mathematics examination questions of Taian senior high school entrance examination in 2009
The area of triangle BPD is equal to determinant. BP=X, and the area of triangle BPD is 4X. Y=0.5( 10-X)H, and the area of triangle BPD is 5h. If H is replaced by the expressions of X and Y, the relationship between X and Y can be 2x( 10-x)= 1