问题
填空题
已知a+b=3，ab=2，则a2+b2 = .
答案
5
题目分析：根据完全平方公式可得
，再整体代入即可求得结果.
当a+b=3，ab=2时，
点评：解答本题的关键是熟练掌握完全平方公式：
搜题请搜索小程序“爱下问搜题”
已知a+b=3，ab=2，则a2+b2 = .
5
题目分析：根据完全平方公式可得，再整体代入即可求得结果.
当a+b=3，ab=2时，
点评：解答本题的关键是熟练掌握完全平方公式：
阅读短文，然后从方框中选出可以填入文中空白处的单词。
What’s the most popular school activity among American students? The 小题1: is the school dance. Most American high schools have at least two dances 小题2: the year, one in winter and the other in spring. Students attend these events 小题3: it’s a great opportunity for them to meet 小题4: friends. At the dance, there will be snacks and photo booths (机器拍照亭), as well as strict（严格的） rules to 小题5: create a healthy and enjoyable evening for all students. And all the dancers will be given a security check（安检）before they come into the dance 小题6: . This is acceptable. But some rules may be a little bit over the top（过分). For example, a school once asked 小题7: students to keep a standing position while they were dancing. That 小题8: the students couldn’t do anything freely. You’d 小题9: not break the rules because you’ll be asked to leave there, or even worse, be placed on a do not invite list. |