题目内容

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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4
+
2
4
=
5
8
-
2
8
=
6
20
+
9
20
=		 1-
5
6
=
3
7
+
4
7
=
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7
12
=
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3
9
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10
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10
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6
+
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6
=
2
6
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6
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11
15
+
4
15
=
1
2
+
1
2
=
3
12
+
8
12
=
4
18
+
8
18
=
计算．
7
8
-
6
8
=
4
7
-
3
7
=
2
8
+
5
8
=
1
9
+
8
9
=
8
8
-1=
8
9
-
5
10
=
3
5
+
2
5
=
2
3
-
2
3
=		 1
1
3
-
1
3
=
 计算：
1
4
+
2
4
=		 1-
5
6
=
8
9
-
3
9
=
1
6
+
2
6
=
1
2
+
1
2
=
5
8
-
2
8
=
3
7
+
4
7
=		 1-
1
5
=
2
6
+
4
6
=
3
12
+
8
12
=
（2006?北塘区）
4920÷24-17×12 0.25×6.7×4
168.1÷（4.3×2-0.4）
2
3
-(
5
6
-
3
4
)÷
3
8
5
4
×
8
9
-
1
4
×
8
9
15
7
÷[(1-
5
8
)÷
2
8
]．

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