问题 解答题
口算高速直达
5
7
+
1
2
=
5
12
+
1
12
=
0.32=
4
5
+2=
2
3
+
1
5
-
2
3
+
1
5
=
3
4
-0.25=
7
3
+
2
3
=
12.5×8=2-
5
7
-
2
7
=
7
8
-
2
9
+
1
8
=
答案

5
7
+
1
2
=
17
14
5
12
+
1
12
=
1
2
0.32=0.09,
4
5
+2=2
4
5
2
3
+
1
5
-
2
3
+
1
5
=
2
5
3
4
-0.25=0.5,
7
3
+
2
3
=3,
12.5×8=100,2-
5
7
-
2
7
=1,
7
8
-
2
9
+
1
8
=
7
9

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