题目内容

3
4
+
1
2
=
1
3
-
1
4
=		 12×
3
4
=
1
5
÷3=
2
7
×14=		 20÷
4
9
=
2
3
×
7
8
=		 0×
2
13
=
2
5
÷
3
2
=
1
2
÷
2
3
=
5
7
÷1=		 14×
5
7
÷14×
5
7
=
分析：前两题按分数加减法的运算法则计算，最后一题按从左到右的顺序计算，其余题目按分数乘除法的计算法则运算．
解答：解：
3
4
+
1
2
=
5
4
        
1
3
-
1
4
=
1
12
                       12×
3
4
=9                     
1
5
÷3=
1
15

2
7
×14=4             20÷
4
9
=45                      
2
3
×
7
8
=
7
12
                   0×
2
13
=0
2
5
÷
3
2
=
4
15
           
1
2
÷
2
3
=
3
4
                     
5
7
÷1=
5
7
                     14×
5
7
÷14×
5
7
=
25
49
．
点评：最后一题要按运算顺序计算，不要被数字所迷惑写成了1．
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7
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1
6
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口算：
3
4
+
1
2
=
1
3
-
1
4
=		 12×
3
4
=
1
5
÷3=		 20÷
4
9
=
5
7
÷1=
2
3
×
7
8
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7
10
×
3
10
+
3
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10
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直接写得数．
9×
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=
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×
5
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=
3
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÷
5
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=
0.13=
1
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×
1
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÷
1
3
×
1
2
=
4
3
÷
3
4
=
2
7
÷
8
7
=		 6÷
3
4
=
1
2
+
1
3
=
1-
4
9
×1-
4
9
=
直接写出得数．
①
3
4
+
1
2
=		 ②
1
3
-
1
4
=		 ③12×
3
4
=		 ④20÷
4
9
=		 ⑤
2
3
×
7
8
=
⑥
2
5
÷
3
2
=		 ⑦0×
2
13
=		 ⑧
1
2
÷
2
3
=		 ⑨
2
7
×14=		 ⑩
1
5
÷3=
直接写得数．
3
4
+
1
2
=
1
3
-
1
4
=
8
9
×72=		 63÷
7
9
=
3
4
×
2
9
=
5
9
÷
5
6
=
5
8
÷10=
3
8
×
4
5
÷
3
8
×
4
5
=		 6：15= 0.25：0.4=
3
8
：
3
4
=		 0.6：
1
2
=

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