3. For any two numbers $x, y$, define a new operation with the following rules:
$$
x \text { - } y \times x-x \div 2, x \oplus y=x+y \div 2 \text {, }
$$

Calculate according to these rules, 3.6 2 $2=$ $\qquad$ , $0.12-(7.5 \oplus 4.8)=$ $\qquad$ .
【Solution】Solution: (1) 3.6 $2=3.6 \times 2-3.6 \div 2=7.2-1.8=5.4$,
$$
\begin{array}{l} 
\text { (2) } 7.5 \oplus 4.8=7.5+4.8 \div 2=7.5+2.4=9.9, \\
\cdots \\
122(7.5 \oplus 4.8), \\
\cdots \\
= 12^{\times 9.9-0.12 \div 2,} \\
\cdots \\
= 0.12 \times 9.4, \\
= \frac{4}{33} \times 9.4, \\
= \frac{188}{165}
\end{array}
$$

Therefore, the answers are: $5.4, \frac{188}{165}$.