题目内容
计算
|
|
| ||||||||||||||||
|
| 21×
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:依据分数乘法计算方法,按照从左到右顺序计算即可解答.
解答:
解:
×
×
=
×
=
;
×
×
=
×
=
;
×12×
=9×
=2;
×
×
=
×
=
;
×
×6
=
×6
=
;
21×
×
=
×
=
.
3 |
4 |
8 |
15 |
5 |
12 |
=
2 |
5 |
5 |
12 |
=
1 |
6 |
4 |
3 |
4 |
15 |
9 |
16 |
=
16 |
45 |
9 |
16 |
=
1 |
5 |
3 |
4 |
2 |
9 |
=9×
2 |
9 |
=2;
7 |
4 |
10 |
21 |
3 |
5 |
=
5 |
6 |
3 |
5 |
=
1 |
2 |
11 |
36 |
9 |
22 |
=
1 |
8 |
=
3 |
4 |
21×
3 |
35 |
5 |
12 |
=
9 |
5 |
5 |
12 |
=
3 |
4 |
点评:本题主要考查学生运用分数乘法计算方法解决问题的能力.
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