题目内容

口算．
1
5
+
1
4
=
2
3
+
1
4
=
3
5
-
1
2
=
9
10
+
1
10
=
1
4
-
1
8
=		 1-
3
13
=
1
2
-
1
3
=
7
8
-
1
8
=
5
6
-
2
6
=
8
9
+
7
9
=
3
11
-
3
11
=
3
8
+
1
4
=
分析：根据分数加减法的计算方法进行计算．
解答：解：
1
5
+
1
4
=
9
20
2
3
+
1
4
=
11
12
3
5
-
1
2
=
1
10
9
10
+
1
10
=1
1
4
-
1
8
=
1
8
 1-
3
13
=
10
13
1
2
-
1
3
=
1
6
7
8
-
1
8
=
3
4
5
6
-
2
6
=
1
2
8
9
+
7
9
=
5
3
3
11
-
3
11
=0
3
8
+
1
4
=
5
8
点评：口算时，注意运算符号和数据，然后再进一步计算．
练习册系列答案
相关题目
口算．
1
3
-
1
4
=		 42÷10%= 1-0.5= 48×12.5%=
9×
1
9
÷9×
1
9
=		 （
1
4
-
1
5
）×20=		 7.2÷0.08= 5÷
5
7
-
5
7
÷5=
口算．
1
3
+
1
4
=
1
5
-
1
6
=		 1-
5
8
=
1
4
+
1
5
=
2
7
+
1
3
=		 1-
7
15
=
3
4
-
1
6
=
7
10
-
1
2
=
3
8
-
1
4
=
5
9
-
4
9
=
1
2
-
1
4
=		 1-
13
13
=
口算．
1
3
-
1
4
=
1
5
-
1
10
=
7
9
×
6
7
=
6
7
÷6=
12
13
×26=
1÷
5
6
=
3
4
÷
1
8
=		 28×
3
4
=
7
8
×
4
7
=
2
5
×99+
2
5
=
14÷
1
5
=		 (
2
3
-
1
2
)×12=		 1÷
1
4
×4=		 15×
1
3
=
1
3
+
2
13
×
13
14
=
口算：
3.14×2= 3.14×3= 3.14×4= 3.14×5= 3.14×6=
3.14×7= 3.14×8= 3.14×9= 3.14×12= 3.14×15=
3.14×22= 3.14×32= 3.14×42= 3.14×52= 3.14×62=
3.14×72= 3.14×82= 3.14×92= 3.14×152= 3.14×252=

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网