题目内容

口算．
3
4
-
1
4
=
3
4
÷
1
4
=
3
8
+0.625=
3+
3
4
=		 0.6+
2
5
=		 10+
1
10
=
分析：利用分数加减法计算法则和除法法则计算即可；注意（3）（5）把小数化为分数计算．
解答：
解：
3
4
-
1
4
=
1
2
3
4
÷
1
4
=3
3
8
+0.625=1
3+
3
4
=3
3
4
 0.6+
2
5
=1		 10+
1
10
=10
1
10
点评：此题考查分数四则运算的计算方法，注意计算结果的化简．
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3
4
+
1
2
=
1
3
-
1
4
=		 12×
3
4
=
1
5
÷3=		 20÷
4
9
=
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7
÷1=
2
3
×
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=
7
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×
3
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+
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口算．
1
3
-
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4
=
1
5
-
1
10
=
7
9
×
6
7
=
6
7
÷6=
12
13
×26=
1÷
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=
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÷
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×
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)×12=		 1÷
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+
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×
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=
口算：
3
4
+
1
2
=
5
4
5
4
        
1
3
-
1
4
=
1
12
1
12
          12×
3
4
=
9
9
          
1
5
÷3=
1
15
1
15

20÷
4
9
=
45
45
       
5
7
÷1=
5
7
5
7
          
2
3
×
7
8
=
7
12
7
12
           
7
10
×
3
10
+
3
10
×
3
10
=
3
10
3
10

7
12
×
4
7
4
7
=
1
3
      
4
5
÷
3
5
3
5
=
4
3
．
口算．
3
4
×
5
6
=
1
7
÷5=		 1÷
4
7
=		 15×
4
15
=		 1.25×
1
8
=
2
9
×4=
5
6
÷
1
4
=		 1.8-40%= 12×（
3
4
+
5
6
）=
2
5
×6+4×
2
5
=

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