q$)$ solve by Runge$-$kutta method:

$(1)$

$\{\begin{array}{c}1+(t-y{)}^2\end{array}$

$y(2)=1$

$y(2)=1,2t3$

use $h=0\mathrm{.}5,n=2,$ exact solutions $t+\frac{1}{1-t}$