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