问题 填空题
化简:
2
5
=______;
1
3
+2
=______;
(1-
2
)
2
=______.
答案

2
5
=
2×5
5×5
=
10
5

1
3
+2
=
2-
3
(
3
+2)(2-
3
)
=2-
3

(1-
2
)
2
=|1-
2
|=
2
-1

选择题
单项选择题