题目内容

用递等式计算
4
7
×
21
10
×
2
5
3
5
×
2
9
×15
15÷
9
10
×
3
5
4×
5
12
÷
5
9
5
8
÷
7
12
÷
7
10
1
2
÷
5
4
×
2
3
(1)
4
7
×
21
10
×
2
5
,
=
6
5
×
2
5
,
=
12
25
;

(2)
3
5
×
2
9
×15,
=
2
15
×15,
=2;

(3)15÷
9
10
×
3
5
,
=15×
10
9
×
3
5
,
=
50
3
×
3
5
,
=10;

(4)4×
5
12
÷
5
9
,
=
5
3
×
9
5
,
=3;

(5)
5
8
÷
7
12
÷
7
10
,
=
5
8
×
12
7
×
10
7
,
=
15
14
×
10
7
,
=1
26
49
;

(6)
1
2
÷
5
4
×
2
3
,
=
1
2
×
4
5
×
2
3
,
=
2
5
×
2
3
,
=
4
15
.
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