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5
8
+
2
8
=
8
9
-
7
9
=
180×4= 1-
7
9
=
4
5
-
2
5
=
25÷6=
3
4
+
1
4
=
1-
7
8
+
3
8
=
208×3=
4
5
-
1
5
=
3
8
+
5
8
-
2
8
=
150×7=
6
9
-
1
9
=
1-
1
9
-
2
9
=
21×5= 420-190=
分析:根据同分母分数加减法的计算法则,以及整数四则运算的法则求解即可.
解答:解:
5
8
+
2
8
=
7
8
8
9
-
7
9
=
1
9
180×4=720 1-
7
9
=
2
9
4
5
-
2
5
=
2
5
25÷6=
25
6
3
4
+
1
4
=1
1-
7
8
+
3
8
=
1
2
208×3=624
4
5
-
1
5
=
3
5
3
8
+
5
8
-
2
8
=
3
4
150×7=1050
6
9
-
1
9
=
5
9
1-
1
9
-
2
9
=
2
3
21×5=105 420-190=230.
点评:本题是考查了分数加减法的计算,计算时要细心,注意把结果化成最简分数.
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