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直接写出得数.
1
12
×6
=
1-
5
8
=
1
2
÷3
=
4+
2
3
=
(
1
4
+
1
3
)×12
=
3
4
×
2
3
=
10÷
1
10
=
5
14
×7
=
6
11
÷
6
11
=
1÷(
1
4
×
1
5
)
=
4
5
÷
2
5
=
1
2
×3
=
7
8
=
5
8
-
1
2
=
1
13
×
1
2
×39
=
100×
8
25
=
6
7
÷
2
7
=
1
2
-
1
3
=
8
25
+
4
5
=
9×(2+
5
9
)
=
70÷
7
10
=
19×
1
38
=
2
9
×
3
5
=
5
6
-
2
3
=
1
4
÷4×
1
4
=
分析:本题根据分数乘法、除法、加法及减法的运算法则计算即可.
1
4
+
1
3
)×12、9×(2+
5
9
)可根据乘法分配律计算;
1
13
×
1
2
×39可根据乘法交换律计算.
解答:解:
1
12
×6
=
1
2
1-
5
8
=
3
8
1
2
÷3
=
1
6
4+
2
3
=4
2
3
(
1
4
+
1
3
)×12
=7,
3
4
×
2
3
=
1
2
10÷
1
10
=100,
5
14
×7
=
5
2
6
11
÷
6
11
=1,
1÷(
1
4
×
1
5
)
=20,
4
5
÷
2
5
=2,
1
2
×3
=
3
2
7
8
=
8
7
5
8
-
1
2
=
1
8
1
13
×
1
2
×39
=
3
2
100×
8
25
=32,
6
7
÷
2
7
=3,
1
2
-
1
3
=
1
6
8
25
+
4
5
=
28
25
9×(2+
5
9
)
=23,
70÷
7
10
=100,
19×
1
38
=
1
2
2
9
×
3
5
=
2
15
5
6
-
2
3
=
1
6
1
4
÷4×
1
4
=
1
16
点评:完成本题要注意分析式中数据的特点,能简便计算的要简便计算.
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