题目内容

计算．
2
8
+
5
8
=
4
5
+
1
5
=
6
9
-
5
9
=
2
8
+
5
8
=
7
8
；
4
5
+
1
5
=1；
6
9
-
5
9
=
1
9
．
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相关题目
直接写出得数
18×
5
9
=		500×0.3=4÷20%=
2
3
-
2
5
=		6.5-1.45=
15÷
3
5
=		1-39%=
1
4
+
1
6
=
5
7
×9÷
5
7
×
1
9
=		50×（1+50%）=
3
4
×2=
1
6
+
1
2
=
5
9
÷5=
1
12
×
6
7
=
3
4
÷3=
5
4
×
5
4
=
5
8
÷1=		5-
2
3
=
3
9
×12=
3
5
×
5
12
=		4-
2
3
=
7
12
×3=
2
7
÷14=		8+
3
5
=		0×
13
30
=		39×
3
13
=
8×
1
2
=
5
6
÷
3
4
=		4×
12
7
=		20÷
4
5
=
1-
9
10
=		2.5×16=
5
12
÷
1
6
=
3
2
×
4
5
=
8
15
÷24=		11÷
22
8
=
1
2
÷
3
8
=
4
7
÷
2
3
=
3
4
+
1
7
=		1.5÷0.05=0×
1
9
×9=		1.5÷0.05=
5
8
÷
7
12
=
4
5
×
2
3
×
5
6
=
5
9
×
2
5
=		2.5×0.4=
14×
5
16
=		(
1
2
+
1
3
)×12=
14
33
×
3
7
=		0×
7
9
=
5
8
×
5
8
=
5
21
+
4
7
=
7
9
÷7=		2-
1
4
=
3
5
-
1
8
=
4
21
÷
8
7
=
2
3
-
1
4
=		6.25+1.75=
1
2
÷
7
18
=
9
10
×6=
1
8
+
1
9
=
3
4
÷
4
3
=
1
2
×
2
3
=		12-
5
7
=		1÷
2
5
=
2
9
÷18=
7
28
÷
2
9
=		10×1×
2
5
=		20÷
4
5
=
1
3
×9+9×
2
3
=
42÷
21
23
=
3
8
÷12=
比
5
8
多
2
8
的数是______，比1少
2
5
的数是______．
5
7
-
2
7
=
2
5
+
1
5
=
3
6
+
2
6
=		1-
7
9
=
7
8
-
4
8
=
2
4
+
2
4
=
4
9
+
1
9
=
2
3
+
1
3
=
1
4
+
1
5
=		1-
6
11
=		1÷
6
7
=
1
2
-
1
3
=
1
5
×
1
5
=		0÷
19
10
=
0.9+99×0.9=（
5
6
+
1
4
）×12=
3
4
：X=3：12．
一根木料长
4
5
米，若用去
1
2
米，还剩______米．若用去
1
2
，还剩______米．
计算（能简算要简算）：
3
5
+
2
3
-
5
6
7
8
-
5
12
+
1
6
1
5
+
1
8
+
1
5
+
7
8
5
14
-（
2
7
-
1
5
）
3个
1
7
加上2个
1
7
，得______，再加______个
1
7
是1．

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