问题 解答题
口算
1
7
=
7
10
×
5
7
=
2
3
×
2
3
=
6
7
+6=
2
5
×
1
2
=
8
9
×4=
0.5-
1
4
=
14
45
×
15
21
=
答案

1
7
=
6
7
7
10
×
5
7
=
1
2
2
3
×
2
3
=
4
9
6
7
+6=6
6
7
2
5
×
1
2
=
1
5
8
9
×4=
32
9
0.5-
1
4
=
1
4
14
45
×
15
21
=
2
9

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