题目内容

1
5
+
1
5
=
7
8
-
3
8
=
1
6
+
2
6
=
1
6
+
5
6
=
6
7
-
5
7
=
4
9
+
4
9
=
5
7
-
3
7
=
2
10
+
5
10
=
7
9
-
4
9
=
3
4
-
1
4
=
分析：直接利用同分母分数加减法计算法则：分母不变，只把分子相加减；计算得出答案即可．
解答：

解：
1
5
+
1
5
=
2
5
7
8
-
3
8
=
1
2
1
6
+
2
6
=
1
2
1
6
+
5
6
=1
6
7
-
5
7
=
1
7
4
9
+
4
9
=
8
9
5
7
-
3
7
=
2
7
2
10
+
5
10
=
7
10
7
9
-
4
9
=
1
3
3
4
-
1
4
=
1
2
点评：此题考查同分母分数加减法的计算方法，注意计算结果的化简．
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相关题目
直接写得数
7
10
-
3
10
=
2
9
+
3
9
=
3
7
+
4
7
=
7
9
-
2
3
=
7
10
+
3
5
=
3
4
+
1
5
=
7
8
-
7
8
=
脱式计算，能简算的要简算．
15.8-
7
8
+
1
5
-
11
18
1
8
÷[（
1
2
+
1
3
）×
3
10
]		 61
1
11
÷12               
2+20×（
1
4
-
1
5
）              		 4×0.28×2.5．
直接写得数
15÷
5
2
=
7
8
÷
7
8
=		 6÷
3
5
=
0÷
1
9
=		 3÷
9
10
=		 1÷
7
15
=
3
10
÷
3
5
=
1
3
÷
3
4
=
8
21
÷
4
7
=
4
15
÷
3
4
=
用简便方法计算
709+709×99
5×
17
23
+6÷
23
5

1.2+0.125-
1
5
+
7
8
．

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