12. Observe the following equation:
$$
0 \times 0=0-0,1 \times \frac{1}{2}=1-\frac{1}{2}, \cdots \text {. }
$$

According to the pattern reflected in the equation, write two more equations that satisfy this pattern. $\qquad$
12. $2 \times \frac{2}{3}=2-\frac{2}{3} ; 3 \times \frac{3}{4}=3-\frac{3}{4}$.

If we use $x$ and $y$ to represent these two numbers, the pattern reflected in the equation can be expressed as $xy=x-y$. Therefore, we have
$$
y=\frac{x}{1+x} .
$$

Taking $x=2$, then $y=\frac{2}{3}$; taking $x=3$, then $y=\frac{3}{4}$.