问题 解答题
直接写出得数:
4
5
-
2
5
=______;
1
4
-
1
5
=______;
3
7
+
4
7
=______;
5
8
-(
3
8
+
1
7
)=______;
0.75-
7
10
=______;
3
4
+10=______;
1-
9
11
=______;
1
6
+
1
2
+
1
6
=______.
答案

4
5
-
2
5
=
2
5
1
4
-
1
5
=
1
20
3
7
+
4
7
=1;
5
8
-(
3
8
+
1
7
)=
3
28
0.75-
7
10
=0.05;
3
4
+10=10
3
4
1-
9
11
=
2
11
1
6
+
1
2
+
1
6
=
5
6
故答案为:
2
5
1
20
,1,
3
28
,0.05,10
3
4
2
11
5
6

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