问题 解答题
口算.
2+3.57=

7÷1.4=

390×0.01=

4
5
-
1
3
=

5
6
=

1
6
+
6
5
+
4
5
=
答案

2+3.57=5.57,

7÷1.4=5,

390×0.01=3.9,

4
5
-
1
3
=
7
15

5
6
=
20
3

1
6
+
6
5
+
4
5
=2
1
6

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单项选择题