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
5
12
÷
5
9
5
8
÷
7
12
÷
7
10
1
2
÷
5
4
×
2
3
分析:根据分数的四则混合运算进行计算即可得到答案.
解答:解:(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
点评:此题主要考查的是分数的四则混合运算.
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