题目内容

直接写得数．
1
4
+
1
5
=		1-
6
11
=		1÷
6
7
=
1
2
-
1
3
=
9.6÷1.6=0÷
3
5
=		51×199≈（
5
6
+
1
4
）×12=
1
4
+
1
5
=
9
20
1-
6
11
=
5
11
1÷
6
7
=1
1
6
1
2
-
1
3
=
1
6
9.6÷1.6=60÷
3
5
=0		51×199≈10000（
5
6
+
1
4
）×12=13
练习册系列答案
相关题目
3
21
和一个数合起来是
9
21
，这个数是
6
21
．______．（判断对错）
直接写得数
右
3
+
右
2
=
右
三
-
右
6
=		右÷
3
7
=		7×
三
28
=
4
9
×3=
三
8
+
3
8
=
右
2
-
右
3
=
2
9
÷
2
9
=
4
7
÷4=		3÷
右
3
=
4
三
+
右
右0
=		右8×
右
3
=
1-
5
7
=
1
9
+
8
9
=
1
3
+
5
8
+
2
3
=
5
6
-
1
6
=
13
15
-
2
5
=
1
5
-
1
6
=
1
4
+
1
3
=		1-
1
10
-
7
10
=
3-2.8=2.21+1.79=25×8=420÷7÷6=
下面的计算对吗？并把错的改正过来．
5
9
-
5
12
-
1
12
=
5
9
-(
5
12
-
1
12
)
=
5
9
-
7
9
=
2
9
5
14
+
9
14
+
7
8
=
14
14
+
7
8
=
56
56
+
49
56
=
105
56
=
15
8
1
3
-
1
4
=
1
8
÷
1
6
=		1-
3
5
×
1
3
=
2
7
×
2
7
÷
2
7
×
2
7
=		0.25÷
3
4
=
5
8
+
1
6
+
5
8
=
2
3
×
4
5
÷
2
5
=		1.05×4=268÷14×0=
(
1
5
+
1
3
-
1
6
)×30=		306-16=5.1+0.09=
只列式不计算
1
2
-
1
4
=		1.25×8=2.7×
2
3
=
4
5
÷2=
1÷0.8=
2
3
×
9
14
=		1-
1
2
÷1-
1
2
=
2
3
×0.8+
1
5
×
2
3
=
直接写得数：
1
4
+
1
5
=		1-
6
11
=		1÷
6
7
=
1
2
-
1
3
=
1
2
×
4
5
=		0÷
3
5
=		0.9+99×0.9=（
5
6
+
1
4
）×12=
口算．
3
4
-
1
4
=
3
4
÷
1
4
=
3
8
+0.625=
3+
3
4
=		0.6+
2
5
=		10+
1
10
=

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