题目内容

口算．
4
7
×
1
4
=
2
3
×
2
3
=
7
10
×5=
4÷
4
5
=
5
6
÷
5
3
=
5
8
-
1
4
=
分析：①②③属于分数乘法，约分即可；④⑤属于分数除法，把除法改为乘法，约分计算；⑥属于分数减法，通分计算．
解答：解：
4
7
×
1
4
=
1
7
；       
2
3
×
2
3
=
4
9
；       
7
10
×5=
7
2
；      4÷
4
5
=5；     
5
6
÷
5
3
=
1
2
；        
5
8
-
1
4
=
3
8
．
点评：此题属于分数的计算，根据题目类型，灵活解答．
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7
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13
8
-
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8
=		 1.8÷2.7=
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口算
202×3.14=		 0.6252= 2.67+6.33= 15×
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8
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3%×5%= 3
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7
-（  
4
5
-
4
7
 ）=
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口算．
1
3
-
1
4
=
1
5
-
1
10
=
7
9
×
6
7
=
6
7
÷6=
12
13
×26=
1÷
5
6
=
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4
÷
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8
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3
4
=
7
8
×
4
7
=
2
5
×99+
2
5
=
14÷
1
5
=		 (
2
3
-
1
2
)×12=		 1÷
1
4
×4=		 15×
1
3
=
1
3
+
2
13
×
13
14
=
口算．
4
7
+
2
3
=
99×
1
9
=
15
8
×
4
25
=
6-
3
5
-
2
5
=
1
4
×
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3
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1
5
=
4
15
×75=
23
24
×
8
69
=
1
6
×
4
7
=
5
16
×
18
15
=
1
3
×（1-
1
4
）=

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