3. (6 points) Definition: $a \preccurlyeq b=\frac{\mathrm{a}-1}{\mathrm{~b}}$, then $2 \preccurlyeq(3 \preccurlyeq 4)=$ $\qquad$
【Answer】Solution: $3 \leqslant 4$
$$
\begin{array}{l}
=\frac{3-1}{4} \\
=\frac{1}{2} \\
2 \text { put (3 lead 4) } \\
=2 \pi\left(\frac{1}{2}\right) \\
=\frac{2-1}{\frac{1}{2}} \\
=2 \text {; } \\
\end{array}
$$

Therefore, the answer is: 2.