精英家教网 > 小学数学 > 题目详情
5
9
+
1
9
=
7-2
1
2
=
1
1
5
+0.8=
1.2-
3
5
=
1.7-
5
10
=
2.75+7
1
4
=
8.25-
2
4
=
5
9
-
1
3
=
分析:根据分数和小数加减法的计算方法进行计算即可.
解答:解:
5
9
+
1
9
=
2
3
7-2
1
2
=4.5,
1
1
5
+0.8=2,
1.2-
3
5
=0.6,
1.7-
5
10
=1.2,
2.75+7
1
4
=10,
8.25-
2
4
=7.75,
5
9
-
1
3
=
2
9
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
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