3. (3 points) Definition: $a \oplus b=a+b+a b$, then $(2 \oplus 3) \oplus 4$ is

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3. (3 points) Definition: $a \oplus b=a+b+a b$, then the value of $(2 \oplus 3) \oplus 4$ is $\qquad$ 59.

【Analysis】According to the problem, $a \oplus b$ equals $a$ plus $b$ plus the product of $a$ and $b$. Therefore, use this method to calculate the value of $(2 \oplus 3) \oplus 4$, and solve accordingly.

【Solution】Solution: $(2 \oplus 3) \oplus 4$
$$
\begin{array}{l}
=(2+3+2 \times 3) \oplus 4 \\
=11 \oplus 4 \\
=11+4+11 \times 4 \\
=59
\end{array}
$$

Therefore, the answer is: 59.
【Comment】First, understand the calculation method of the new operation, then substitute the data and calculate according to the order of operations, calculating inside the parentheses first, then outside.