题目内容

1
2
×
2
5
=
1
5
1
5
5
7
÷
2
7
=
5
2
5
2
1
2
÷
1
4
=
2,
2,
1
3
=
9,
9,
10÷
1
8
×8=
640,
640,
5
14
×7=
5
2
5
2
3
5
+
2
5
=
1,
1,
100×
7
20
=
35,
35,
3
16
=
3
2
3
2
3
8
÷
3
8
×
5
6
=
5
6
5
6
1
4
+
1
3
=
7
12
7
12
1
4
=
0,
0,
2
9
=
2
9
2
9
7
12
÷
7
12
=
1,
1,
1
4
÷4×
1
4
=
1
16
1
16
5
6
×36=
30,
30,
3
10
=
10,
10,
10÷
5
9
=
18,
18,
6
5
÷
3
5
=
2,
2,
5
9
×
3
5
×3=
1,
1,
2
7
×14=
4,
4,
2
9
×
3
5
=
2
15
2
15
1
2
×3=
3
2
3
2
6
11
×
11
6
=
1,
1,
9×(2+
5
9
)=
23,
23,
70÷
7
10
=
100,
100,
19×
1
38
=
1
2
1
2
4
5
÷8%=
10,
10,
7
8
=
8
7
8
7
3
4
×
3
8
=
0
0
分析:10÷
1
8
×8,4×
1
4
÷4×
1
4
按照从左到右的顺序计算;9×(2+
5
9
)运用乘法分配律简算;0÷
3
4
×
3
8
根据0除以任何不为0的数,以及0乘任何数都得0求解;其它题目根据运算法则直接求解.
解答:解:
1
2
×
2
5
=
1
5
5
7
÷
2
7
=
5
2
1
2
÷
1
4
=2,
1
3
=9,
10÷
1
8
×8=640,
5
14
×7=
5
2
3
5
+
2
5
=1,
100×
7
20
=35,
3
16
=
3
2
3
8
÷
3
8
×
5
6
=
5
6
1
4
+
1
3
=
7
12
1
4
=0,
2
9
=
2
9
7
12
÷
7
12
=1,
1
4
÷4×
1
4
=
1
16
5
6
×36=30,
3
10
=10,
10÷
5
9
=18,
6
5
÷
3
5
=2,
5
9
×
3
5
×3=1,
2
7
×14=4,
2
9
×
3
5
=
2
15
1
2
×3=
3
2
6
11
×
11
6
=1,
9×(2+
5
9
)=23,
70÷
7
10
=100,
19×
1
38
=
1
2
4
5
÷8%=10,
7
8
=
8
7
3
4
×
3
8
=0.
点评:本题考查了基本的分数乘除法运算,计算时要细心,注意把结果化成最简分数.
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