求由下列参数方程所确定的函数y=f(x)的一阶和二阶导数.

解；一阶导数：y‘=dy/dx=(3-3t²)/(2-2t)=3/2(1+t)二阶导数：y‘’=d²y/dx²=[3/2(1+t)]'/(2t-t²)'=3/2/(2-2t)=3/[4(1-t)]