已知AB=8,BC=6,
CD=8,AD=6,
BD=10,
DM=x,
BM=10-x,
R如图,过点M作ME⊥BC于点E,
ME∥DC,
△BME∽△BDC,MB/BC= BM/BD,
ME=8- 4/5x,
而S△MBP= 1/2×BP×ME,
y= -2/5x2+4x,P不与B重合,那么x>0,可与点C重合,那么x≤6. y= -2/5x2+4x(0<x≤6).
已知AB=8,BC=6,
CD=8,AD=6,
BD=10,
DM=x,
BM=10-x,
R如图,过点M作ME⊥BC于点E,
ME∥DC,
△BME∽△BDC,MB/BC= BM/BD,
ME=8- 4/5x,
而S△MBP= 1/2×BP×ME,
y= -2/5x2+4x,P不与B重合,那么x>0,可与点C重合,那么x≤6. y= -2/5x2+4x(0<x≤6).