题目内容

直接写得数．
3
8
×12=
5
7
÷
10
21
=		 0.9-
1
10
=		 8÷
4
5
=
12×
3
4
×
2
9
=
4
7
÷2÷
1
7
 (
2
3
-
1
4
)×12=		 21×
8
21
=
分析：依据分数四则运算的计算法则，直接进行计算即可．
解答：解：

3
8
×12=
9
2
5
7
÷
10
21
=
3
2
 0.9-
1
10
=
4
5
 8÷
4
5
=10
12×
3
4
×
2
9
=2
4
7
÷2÷
1
7
=2		 (
2
3
-
1
4
)×12=5		 21×
8
21
=8
点评：此题主要考查分数四则运算的计算法则的灵活应用．
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3
8
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3
8
=
1
2
+
1
3
=
5
6
-
2
3
=		 1-
4
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10
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20
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4
=
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=		 2+
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3
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7
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直接写得数
143+298=		 1-0.09=
4
5
×4=		 45.15÷15=
2
5
-
4
15
=		 1÷60%= 0.22+2=
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3
+
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3
÷2=
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5
9
=		 5.38-（1.8+2.38）=
直接写得数
1
5
+
1
3
=		 1÷
3
5
=
3
8
×12×
2
3
=
14
5
×
3
2
+
14
5
×
7
2
=
5
9
+
3
11
+
4
9
+
8
11
=
8-
1
8
=		 2.25-0.25=
9
10
×
1
6
÷
3
5
=
20
9
÷
11
8
-
2
9
×
8
11
=		 5-
1
6
-
5
6
=
直接写得数
2
3
÷
4
15
=		 1÷
2
27
=
9
10
×
3
5
=		 3÷8= 15÷
9
25
=		 8÷
1
7
=
1
7
÷
1
2
=
3
8
-
1
3
=
3
22
×11=
7
8
÷
3
16
=
5
7
÷
10
12
=
1
2
+
3
5
=
直接写得数
①
1
6
+
3
8
=		 ②1-0.25= ③0.72÷0.6=
④125×8= ⑤25×17×4= ⑥13×10.2=

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