问题 解答题
计算:
(1)
14
÷
6
×
2
21

(2)
12
-6
1
3
+
48

(3)(
3
-1)2-(
5
-
2
)(
5
+
2
)
答案

(1)原式=

14×
1
6
×
2
21

=

2
9

=

2
3

(2)原式=2

3
-2
3
+4
3
=4
3

(3)原式=(

3
2-2
3
+1-[(
5
2-(
2
2]

=3-2

3
+1-(5-2)

=3-2

3
+1-3

=1-2

3

单项选择题
单项选择题