1、下降3m
2、+3
3~4:B;C
5、
|
整数 |
正数 |
负数 |
有理数 |
无理数 |
3 |
√ |
√ |
|
√ |
|
0.3030030003… |
|
√ |
|
|
√ |
0.21 |
|
√ |
|
√ |
|
-5/7 |
|
|
√ |
√ |
|
0 |
√ |
|
|
√ |
|
-3.14159 |
|
|
√ |
√ |
|
-10 |
√ |
|
√ |
√ |
|
1/3 |
|
|
|
√ |
|
6、0.101100110001…(答案不唯一)
7、π(答案不唯一)
8~9:C;B
10、正数的集合{0.618, π,0.
2,0.010 010 001…,…};
负数集合{-1/3,-3.14, -2002, -0.3,-5%,…};
有理数集合{-1/3,0.618,-3.14, -2 002,0.2,0.3,-5%,0,…};
无理数集合{π,0.010 010 001…,…}
11、(1) 50%;
(2) 80个