试题:
10
21
×
12
25
33×
7
32
5
8
×
9
4
×
16
45
4
5
-
1
2
×
2
3
7
4
×
1
9
+
1
4
×
1
9
(
1
4
+
7
12
3
5

答案:

我来补答
10
21
×
12
25
=
8
35


②33×
7
32

=(32+1)×
7
32

=32×
7
32
+1×
7
32

=7+
7
32

=7
7
32


5
8
×
9
4
×
16
45

=
5
8
×
16
45
×
9
4

=
1
2


4
5
-
1
2
×
2
3

=
4
5
-
1
3

=
7
15


7
4
×
1
9
+
1
4
×
1
9

=(
7
4
+
1
4
)×
1
9

=2×
1
9

=
2
9


(
1
4
+
7
12
3
5

=
1
4
×
3
5
+
7
12
×
3
5

=
3
20
+
7
20

=
1
2
 
 
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