题目内容

直接写得数．
1
3
+
1
5
=
4
7
+
2
7
=		 2+
3
4
=
1
3
-
1
5
=
4
7
-
2
7
=
2-
3
4
=
1
2
+
2
5
=
1
2
-
2
5
=
3
4
-
1
2
=		 1-
2
5
=
分析：根据异分母分数相加减法的计算方法，可先通分，然后再按照同分母分数相加减的计算方法进行计算即可．
解答：解：
1
3
+
1
5
=
8
15
4
7
+
2
7
=
6
7
 2+
3
4
=2
3
4
1
3
-
1
5
=
2
15
4
7
-
2
7
=
2
7
2-
3
4
=1
1
4
1
2
+
2
5
=
9
10
1
2
-
2
5
=
1
10
3
4
-
1
2
=
1
4
 1-
2
5
=
3
5
点评：此题主要考查的是异分母分数相加减法的计算方法的应用．
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×1=
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×
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1
5
+
1
3
=		 1÷
3
5
=
3
8
×12×
2
3
=
14
5
×
3
2
+
14
5
×
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=
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9
+
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11
+
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9
+
8
11
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÷
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5
=
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9
÷
11
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-
2
9
×
8
11
=		 5-
1
6
-
5
6
=
直接写得数．
1
3
×1=
1
4
×
2
5
=
5
6
×12=
7
12
×
3
14
=
30×
3
5
=
9×
7
18
=
2
3
×
9
10
=
4
25
×50=		 6×
1
6
=
4
11
×
11
4
=

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