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问题 解答题
计算：|3.14-π|+3.14÷（
3
2
+1）0-2cos45°+（
2
-1）-1+（-1）2009．
答案

原式=-（3.14-π）+3.14÷1-2×

2
2
+
1
2
-1
+（-1）

=π-3.14+3.14-

2
+
2
+1
2-1
-1

=π-

2
+
2
+1-1

=π．

填空题

用括号内所给单词的正确形式填空。

1. My sister is a ________ (music).

2. Jim can swim. He often helps me ________ (swim).

3. She ________ (think) he can sing.

4. We want to play soccer, come and join ________ (we).

5. ________ he often ________ (watch) TV?

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