问题 解答题
3
4
×12=
1-
5
12
=
49×2×
1
7
=
4
9
+
5
9
×2=
4
3
×
1
4
-
1
3
=
2
5
×4=
答案

3
4
×12=9,
1-
5
12
=
7
12
49×2×
1
7
=14,
4
9
+
5
9
×2=2,
4
3
×
1
4
-
1
3
=0,
2
5
×4=
8
5

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