题目内容

计算：
2
3
-
3
5
=______．
2
3
-
3
5

=
10
15
-
9
15
，
=
1
15
．
故答案为：
1
15
．
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比一比，看谁算得对又快
2
8
+
5
8
=
1
3
+
1
3
=
3
4
-
1
3
=
7
9
-
1
9
=
4
5
-
2
5
=
2
7
+
4
7
=
1-
2
10
=		1-
1
6
=		1-
3
7
=
直接写出复数．
5
8
+0.125=		4×
2
3
÷4×
2
3
=
1
6
-
1
7
=		0.1×10÷0.1×10=2.5×40=
1
2
-
1
2
×
1
2
=		36：0.8=8.9×11-8.9=
5
6
÷
6
5
=		10÷0.1×10=
1
2
+
1
5
=
3
4
-
1
2
=
2
3
÷
2
9
=
1
2
-
1
3
=
18+
2
3
=
8
9
×
9
8
=
1
2
÷7=		4-
2
3
=
口算．
4
15
+
7
15
=
5
6
-
1
6
=
2
5
+
2
5
=
3
4
-
1
4
=
1
2
+
1
2
=
1
3
+
1
4
=
1
5
-
1
8
=		2-
3
4
=		1-
1
8
-
3
8
=
计算：2-1
2
3
=______，2.25÷
3
4
=______，
1
3
+
1
6
=______，1
2
5
×0.5=______．
1
2
+
1
4
=		18×
5
6
=
1
3
-
1
6
=		12÷
3
4
=
7
15
×
5
7
=
5
8
÷10=		1-
5
7
=
3
4
×
8
9
=
3
5
+
7
5
=
3
5
÷
3
10
=
9
7
11
-（2
5
8
+4
7
11
）
7
10
-
4
15
=
的1
六0
-
小
六0
=
的9
六0
______．（判断正误）

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