试题:
口算
1-
2
9
=
0.22×5=0.23=
1
5
-
1
10
=
3
4
-
3
4
=
1
3
+
1
4
=

答案:

我来补答
1-
2
9
=
5
9
0.22×5=1.1,0.23=0.008,
1
5
-
1
10
=
1
10
3
4
-
3
4
=0,
1
3
+
1
4
=
7
12
 
 
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