$$
\begin{array}{l}
\text { 1. Given } A=\left\{x: 6 x^{2}-x-2 \geqslant 0\right\}, \\
B=\left\{x: 7 x^{2}-5 x<0\right\}, \quad I=R .
\end{array}
$$

Then $A \cap B=$ $\qquad$ $\triangle \overline{U B}=$ $\qquad$
$$
\begin{array}{l}
\text { 1. } A \cap B=\left\{x: \frac{2}{3} \leqslant x<\frac{5}{7}\right\}, \\
\overline{A \cup B}=\left\{x:-\frac{1}{2}<x \leqslant 0\right\}
\end{array}
$$