题目内容

计算下面各题.
5
8
-
1
6
=
3
10
+
2
5
=
1
5
-
1
8
=
4
9
+
1
3
=
3
5
-(
1
2
-
1
4
)=
3
10
+
1
5
-
1
3
=
8
9
-(
1
6
+
1
3
)=
分析:先通分,再利用同分母分数加减法法则计算即可.
解答:
解:
5
8
-
1
6
=
15
24
-
4
24
=
11
24
3
10
+
2
5
=
3
10
+
4
10
=
7
10
1
5
-
1
8
=
8
40
-
5
40
=
3
40
4
9
+
1
3
=
4
9
+
3
9
=
7
9
3
5
-(
1
2
-
1
4
)=
12
20
-
5
20
=
7
20
3
10
+
1
5
-
1
3
=
9
30
+
6
30
-
10
30
=
1
6
8
9
-(
1
6
+
1
3
)=
8
9
-
1
2
=
16
18
-
9
18
=
7
18
.
点评:此题考查异分母分数加减法计算方法,通过通分把异分母化为同分母计算.
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