问题 解答题
计算:
(1)
8
-
1
8
48
-(
2
3
4
1
2
-2
3
4
);
(2)
3
÷
1
2
-1
×(
8
-2)+2(
2
+1)0
(3)
6
÷(
1
3
+
1
2
)+
50

(4)10
1
5
×[(
5
+1
2
2-(
5
-1
2
2].
答案

(1)原式=2

2
-
3
2
-
2
+
3
=
2
+
3
2

(2)原式=

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

(3)原式=

6
÷
3
+
2
6
+5
2
=
6
3
+
2
+5
2
=6
3
-6
2
+5
2
=6
3
-
2

(4)原式=2

5
5
+1
2
+
5
-1
2
)(
5
+1
2
-
5
-1
2
)=2
5
×
5
×1=10.

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