题目

已知，求的平方根. 答案：【答案】【解析】试题分析:根据平方根的意义可得: ,解得,然后代入原式可得: ,然后把, 代入求值再求平方根即可求解.试题解析: 根据平方根的意义可得: ,解得,然后代入原式可得: ,把, 代入,所以的平方根是.— Why didn’t you go to the cinema yesterday? 　 — I ____, but my wife returned from France the moment I was leaving. 　 A. was going to　　 B. would　　 　 C. did　　　 D. had