题目内容
| 计算下面各题. (1)
| (2)
| (3)15÷
| ||||||||||||||
(4)4×
| (5)
| (6)
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:除法和乘法都是第二级运算,依据四则混合运算顺序:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,在题干中的6个算式中,都是只含有乘法或除法或者乘除法,故按照从左到右顺序计算即可解答.
解答:
解:(1)
×21×
=15×
=4
;
(2)
×
×15
=
×15
=5
;
(3)15÷
×
=
×
=7
;
(4)4×
÷
=
÷
=1
;
(5)
÷25÷
=
÷
=
;
(6)
÷
×
=
×
=
.
| 5 |
| 7 |
| 3 |
| 10 |
=15×
| 3 |
| 10 |
=4
| 1 |
| 2 |
(2)
| 3 |
| 5 |
| 7 |
| 12 |
=
| 7 |
| 20 |
=5
| 1 |
| 4 |
(3)15÷
| 9 |
| 10 |
| 3 |
| 7 |
=
| 50 |
| 3 |
| 3 |
| 7 |
=7
| 1 |
| 7 |
(4)4×
| 5 |
| 12 |
| 8 |
| 9 |
=
| 5 |
| 3 |
| 8 |
| 9 |
=1
| 7 |
| 8 |
(5)
| 5 |
| 8 |
| 7 |
| 10 |
=
| 1 |
| 40 |
| 7 |
| 10 |
=
| 1 |
| 28 |
(6)
| 1 |
| 2 |
| 5 |
| 4 |
| 2 |
| 3 |
=
| 2 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 15 |
点评:依据四则运算计算方法正确进行计算,是本题考查知识点,关键是计算结果要准确.
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