问题 解答题
口算.
3.8+0.2=40×80=2700÷3=1-0.1=
3
5
+
1
5
=
1-
3
8
=
5
9
-
2
9
=
1
2
+
1
2
=
答案

3.8+0.2=4,40×80=3200,2700÷3=900,1-0.1=0.9,
3
5
+
1
5
=
4
5
1-
3
8
=
5
8
5
9
-
2
9
=
1
3
1
2
+
1
2
=1.

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