题目

阅读理解On July 18th, 2018, Mike and his parents went to Qingdao, a city in Shandong Province for summer vacation. Qingdao is a beautiful city with sea.It was about 12: 00 when they arrived there on the first day. They found a hotel and had a short rest. It was really hot and they decided to go to the beach. At about 3:30 p.m. ,they got to the beach. There were many people. Some were lying on the beach and many children were playing in the water. Mike was playing with them and he was very happy. His parents also felt relaxed. About two hours later, they went back to the hotel. On the secon根据下列表格的对应值:请你写出方程ax2+bx+c=0(a≠0,a,b,c为常数)的一个近似解______(精确到0.1).      x  2 3 2.5 2.7 2.6 2.65   ax2+bx+c -1 1 -0.25 0.19 -0.04 0.0725
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