问题 解答题
直接写出得数.
1
2
+
2
5
=
0.77+0.33=
4
5
×4+4×
1
4
=
5
4
-(
3
7
+
1
7
)
=
1
2
+
1
3
-
1
2
+
1
3
=
答案

1
2
+
2
5
=
9
10
0.77+0.33=1.1,
4
5
×4+4×
1
4
=
21
5
5
4
-(
3
7
+
1
7
)
=
19
28
1
2
+
1
3
-
1
2
+
1
3
=
2
3
故答案为:
9
10
,1.1,
21
5
19
28
2
3

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