问题 解答题
直接写出下面各题的得数.
1
4
+
1
5
=
1
3
÷
3
4
=
4
7
÷
7
16
=
4
7
×21÷
7
12
=
7
8
+
7
8
-
7
8
+
7
8
=
2+80%=
答案

1
4
+
1
5
=
9
20
1
3
÷
3
4
=
4
9
4
7
÷
7
16
=
64
49

4
7
×21÷
7
12
=
144
7
7
8
+
7
8
-
7
8
+
7
8
=
7
4
; 2+80%=2.8.

故答案为:

9
20
4
9
64
49
144
7
7
4
;2.8.

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