1、PA=2t=6
OE=t=3
OP=OA-PA=8-2×3=2
S△PEF
=S△AOB-S△POE-S△APF
=1/2×8×6-1/2×3×6-1/2×6×3
=24-9-9
=6
2、
S△PEF=S△AOB-S△POE-S△APF
16/3=1/2×8×6-1/2×t×(8-2t)-1/2×2t×t
4t=24-16/3
t=6-4/3
t=14/3
PA=2×14/3=28/3
∴PA-OA=28/3-8=4/3
∴P坐标（-4/3,0）
3、
1、PA=2t=6
OE=t=3
OP=OA-PA=8-2×3=2
S△PEF
=S△AOB-S△POE-S△APF
=1/2×8×6-1/2×3×6-1/2×6×3
=24-9-9
=6
2、
S△PEF=S△AOB-S△POE-S△APF
16/3=1/2×8×6-1/2×t×(8-2t)-1/2×2t×t
4t=24-16/3
t=6-4/3
t=14/3
PA=2×14/3=28/3
∴PA-OA=28/3-8=4/3
∴P坐标（-4/3,0）
3、