问题 填空题
计算:±
2
1
4
=______;-
(-5)2
=______;
3-27
=______;-
30.008
=______.
答案

±

2
1
4
9
4
3
2

-

(-5)2
=-
25
=-5;

3-27
=-3;

-

30.008
=-0.2.

单项选择题
单项选择题