题目内容
计算.
×
×
÷7÷
÷
×
.
| 7 |
| 12 |
| 4 |
| 15 |
| 3 |
| 14 |
| 5 |
| 8 |
| 10 |
| 7 |
| 2 |
| 3 |
| 10 |
| 9 |
| 5 |
| 4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先约分再计算;
(2)把连除改为连乘计算;
(3)把除法改为乘法计算.
(2)把连除改为连乘计算;
(3)把除法改为乘法计算.
解答:
解:(1)12×
×
=
;
(2)
÷7÷
=
×
×
=
;
(3)
÷
×
=
×
×
=
.
| 4 |
| 15 |
| 3 |
| 14 |
=
| 24 |
| 35 |
(2)
| 5 |
| 8 |
| 10 |
| 7 |
=
| 5 |
| 8 |
| 1 |
| 7 |
| 7 |
| 10 |
=
| 1 |
| 16 |
(3)
| 2 |
| 3 |
| 10 |
| 9 |
| 5 |
| 4 |
=
| 2 |
| 3 |
| 9 |
| 10 |
| 5 |
| 4 |
=
| 3 |
| 4 |
点评:混合运算的关键是抓住运算顺序,正确按照运算顺序计算.
练习册系列答案
相关题目
18.495保留两位小数的近似值是( )
| A、18.49 | B、18.5 |
| C、18.50 |