直接寫出得數(shù).
1
3
+
1
3
=
1
4
+
1
2
=
7
8
-
4
8
=
1-
5
16
=
1
4
+
3
4
=
5
9
-
1
9
=
1-
2
11
=
7
9
+
2
9
=
6
7
+
1
7
=
1
5
+
2
5
=
9
10
-
9
10
=
1-
5
7
=
分析:本題根據(jù)同分母分數(shù)的加法與減法的運算法則計算即可:同分母分數(shù)相加減,分子相加減,分母不變.
解答:
解:
1
3
+
1
3
=
2
3
1
4
+
1
2
=
3
4
7
8
-
4
8
=
3
8
1-
5
16
=
11
16
1
4
+
3
4
=1
5
9
-
1
9
=
4
9
1-
2
11
=
9
11
7
9
+
2
9
=1
6
7
+
1
7
=1
1
5
+
2
5
=
3
5
9
10
-
9
10
=0
1-
5
7
=
2
7
故答案為:
2
3
,
3
4
,
3
8
,
11
16
,1,
4
9
,
9
11
,1,1,
3
5
,0,
2
7
點評:本題中的數(shù)據(jù)較為簡單,在保證做題質(zhì)量的同時,要盡量提高答題的速度.
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