问题
填空题
已知，2a+b=4，ab=1，则a2+
|
答案
∵2a+b=4，
∴a+
=2，b 2
∴（a+
）2=a2+b 2
+1=4，b2 4
∴a2+
-1=4-1-1=2．b2 4
搜题请搜索小程序“爱下问搜题”
已知，2a+b=4，ab=1，则a2+
|
∵2a+b=4，
∴a+
=2，b 2
∴（a+
）2=a2+b 2
+1=4，b2 4
∴a2+
-1=4-1-1=2．b2 4
| 从方框中选择适当的句子,完成下面的对话(其中有两项是多余选项) | |
Lingling: Hi , Daming. Daming: Where does she live 1 Lingling: 2 Daming: Where is your hometown? Lingling: 3 It's famous for bananas. Daming: What's the population of it? Lingling: 4 Daming: Is your hometown newer than before（以前）? Lingling: Yes, it is.And it's more beautiful. Daming: 5 Can you take photos when you get back next week？ Lingling: No problem! |