3. In the following three expressions, each has four squares, fill in the numbers 1, 9, 8, 5 respectively, so that the results of each expression are perfect squares.
(1) $\square \times \square+\square \times \square=(\quad)^{2}$;
(2) $\square \times \square+\square=(\quad)^{2}$;
(3) $\square-\frac{\square}{\square-\square}=(\quad)^{2}$.
3 .
(1) $8 \times 5 + 1 \times 9 = 7^{2}$;
(2) $\frac{8 \times 5}{9 + 1} = 2^{2}$;
(3) $5 - \frac{8}{9 - 1} = 2^{2}$.