问题 解答题
口算
56+289=
1.9+2.09=
1
3
+
1
4
=
0.3-0.03=
9+99+999+3=35×
5
7
=
0.01÷0.2=
5
6
×
3
10
=
1
2
-
1
3
=
7.2÷9=
答案

56+289=3451.9+2.09=3.99
1
3
+
1
4
=
7
12
0.3-0.03=0.27
9+99+999+3=111035×
5
7
=25
0.01÷0.2=0.05
5
6
×
3
10
=
1
4
1
2
-
1
3
=
1
6
7.2÷9=0.8

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