题目

Yesterday the police were joined by more than 20 volunteers in the continuing search for the two missing teenagers, Vicky Gray and Tom Hunter, and their guide, Gavin Jones. The police said that they had disappeared during an adventure tour of Cape York Peninsula. This was the second day of the search and the police were now very worried about the safety of the three missing people. The police said that the search had covered a wide area, but the rainforest was thick and their work was made harder by the recent rain. Later on Chief Inspector (警官) Roger Fleet said, “The travelers h（每小题4分，共8分）（1）计算：；   （2）解方程：(3x＋2)2－4＝0