题目内容

口算
1
2
×
1
2
=
1
2
×
1
3
=
7
9
÷
1
9
=
5
6
÷
2
3
=
1-
5
11
=
3
4
÷
3
4
=
2
7
-
2
7
=
6
13
=
1
6
×
1
2
=
4
5
÷
1
5
=
1
4
÷
3
4
=
1
3
×
3
8
=
7
9
+
2
9
=1
1
2
+
1
4
=
1
5
+
4
5
=
1
3
×
1
4
=
4
7
÷
4
7
=
1-
1
6
=
1
5
÷
4
5
=
1
4
÷
3
4
=
考点:分数的加法和减法,分数乘法,分数除法
专题:计算题
分析:异分母分数相加减,先通分变成同分母的分数再计算;
分数乘法:分子相乘的积做分子,分母相乘的积做分母,能约分的先约分;
分数除法:除以一个不为零的数等于乘上这个数的倒数.
解答: 解:
1
2
×
1
2
=
1
4
1
2
×
1
3
=
1
6
7
9
÷
1
9
=7
5
6
÷
2
3
=
5
4
1-
5
11
=
6
11
3
4
÷
3
4
=1
2
7
-
2
7
=0
6
13
=
13
6
1
6
×
1
2
=
1
12
4
5
÷
1
5
=4
1
4
÷
3
4
=
1
3
1
3
×
3
8
=
1
8
7
9
+
2
9
=1
1
2
+
1
4
=
3
4
1
5
+
4
5
=1
1
3
×
1
4
=
1
12
4
7
÷
4
7
=1
1-
1
6
=
5
6
1
5
÷
4
5
=
1
4
1
4
÷
3
4
=
1
3
点评:本题考查了简单的分数计算,计算时要细心,注意把结果化成最简分数.
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