题目内容

直接写得数
1
2
+
2
3
=
0.8+4.2=
7
8
+3=
2
5
-
1
10
=
1.2-
1
5
=
5
13
-
2
93
=
1-
5
19
=
7.7+
3
10
=
12
5
-2=
5-
9
16
=
1
100
-
1
1000
=
1
100
+
1
1000
=
分析:异分母分数相加减,先通分,变成同分母分数,再根据同分母分数相加减,分母不变,分子相加减的方法求解.
解答:
解:
1
2
+
2
3
=
7
6
0.8+4.2=5,
7
8
+3=3
7
8
2
5
-
1
10
=
3
10
1.2-
1
5
=1,
5
13
-
2
93
=
439
1209
1-
5
19
=
14
19
7.7+
3
10
=8,
12
5
-2=
2
5
5-
9
16
=4
7
16
1
100
-
1
1000
=
9
1000
1
100
+
1
1000
=
11
1000
点评:本题主要考查了异分母分数加减法,计算时要细心,把结果化成最简分数.
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