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问题 解答题
计算：
（1）
24
÷
3
-
6
2
+
32

（2）(3+2
5
)2-(4+
7
)(4-
7
)．
答案

（1）原式=2

2
-3
2
+4
2

=3

2
；

（2）原式=9+12

5
+20-16+7

=20+12

5
．

选择题

All his attention________on the computer game he was playing,so he even didn't notice his mother

enter the room. [ ]

A. has been fixed

B. was fixing

C. was fixed  

D. fixed
查看答案
单项选择题

胸外心脏按压，操作者按压患者胸部应用（）.

A、手掌

B、手指

C、左手掌跟部

D、右手掌跟部
查看答案