问题 解答题
计算:
(1)2
12
÷
1
2
50
×
1
2
3
4

(2)(4
2
-3
6
)÷2
2

(3)2
12
+3
1
1
3
-
5
1
3
-
2
3
48

(4)(7+4
3
)(7-4
3
)-(3
5
-1)2

(5)(1+
2
)2(1+
3
)2(1-
2
)2(1-
3
)2
答案

(1)原式=4

3
÷
5
2
2
×
3
4
=
8
3
5
2
×
3
4
=
3
2
5

(2)原式=4

2
÷2
2
-3
6
÷2
2
=2-
3
3
2

(3)原式=4

3
+2
3
-
4
3
3
-
8
3
3
=2
3

(4)原式=72-(4

3
)2-(46-6
5
)=49-48-46+6
5
=-45+6
5

(5)原式=[(1+

2
)(1-
2
)] 2[(1+
3
)(1-
3
)] 
2
=4.

判断题
填空题