解:設(shè)?$P$?點(diǎn)的坐標(biāo)為?$(4t，$??$\frac {1}{t})$?
所以?$D$?點(diǎn)的橫坐標(biāo)為?$4t，$??$C$?點(diǎn)的縱坐標(biāo)為?$\frac {1}{t}$?
因?yàn)辄c(diǎn)?$C，$??$D$?在反比例函數(shù)?$y=\frac {1}{x}$?上
所以?$D(4t，$??$\frac {1}{4t})，$??$C(t，$??$\frac {1}{t})$?
所以?$PC=3t，$??$PD=\frac {1}{t}-\frac {1}{4t}=\frac {3}{4t}$?
?$S_{△PCD}=\frac {1}{2}×PC×PD=\frac {1}{2}×3t×\frac {3}{4t}=\frac {9}{8}$?
