题目内容

（1）
7
9
+2
2
9
=______；
（2）12-7
1
8
=______．
（1）
7
9
+2
2
9
，
=
7
9
+
2
9
+2，
=3；

（2）12-7
1
8
，
=12-7-
1
8
，
=5-
1
8
，
=4
7
8
，
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4
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2
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1
12
×
6
7
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3
4
÷3=
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4
×
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÷1=		5-
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3
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×12=
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×
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12
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2
3
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12
×3=
2
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13
30
=		39×
3
13
=
8×
1
2
=
5
6
÷
3
4
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12
7
=		20÷
4
5
=
1-
9
10
=		2.5×16=
5
12
÷
1
6
=
3
2
×
4
5
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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=
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．
5
8
-
3
8
=
1
2
+
3
2
=
1
3
+
1
6
=
1
5
-
1
10
=
1
2
+
1
3
=
3
4
-
1
2
=		1-
3
7
=		2+
1
3
=
直接写出得数．
7
9
-
4
9
=
1
3
+
1
4
=
2
9
+
1
5
+
7
9
=
1
10
+
3
10
=
1
2
-
1
3
=		1-
5
8
-
3
8
=		0.53=
4
7
+
7
10
-
4
7
=
1
4
-
1
8
+
1
4
-
1
8
=
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
）
直接写出得数．
8
11
+
3
11
=
3
5
-
1
5
=
3
4
-
1
2
=		1-
5
7
=
3
7
-
2
7
=
1
8
+
3
4
=
一根绳子用去
7
8
m，比剩下的少
3
4
m，这根绳子一共长多少m？

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