[填空题]
A triangle with vertices A(3,5), B(5,2) an /.1 - lux;ywo1rtdp qd;jar/cd C(3,2yftb9l )cbm0vep5m7 .) is rotated $90^{\circ}$ anticlockwise about O(0,0) and then reflected in the line y=−x. The rotation is represented by matrix A and reflection by matrix B.
1.Write down the matrix :
(1)A; $\begin{pmatrix}
a&b \\
c&d
\end{pmatrix}$ a = b = c = d =
(2)B.$\begin{pmatrix}
a&b \\
c&d
\end{pmatrix}$ a = b = c = d =
2.Find the matrix that represents the rotation followed by the reflection. BA = $\begin{pmatrix}
a&b \\
c&d
\end{pmatrix}$ a = b = c = d =
3.On the following grid, draw the image of the triangle ABC.
