题目内容
(2011?东莞模拟)计算
9÷
×4+8÷
×5-7÷
×6+6÷
×7-5÷
×8-4÷
×9.
9÷
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
分析:本题可先根据分数除法的计算法则,将式中的除法算式变为乘法算式后再根据加法结合律进行计算.
解答:解:9÷
×4+8÷
×5-7÷
×6+6÷
×7+5×
×8-4÷
×9
=9×
×4+8×
×5-7×
×6+6×
×7+5×
×8-4×
×9,
=(9×
×4-4×
×9)+(6×
×7-7×
×6)+(8×
×5-5×
×8),
=0+0+0,
=0.
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
=9×
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 16 |
| 39 |
| 39 |
| 16 |
=(9×
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
| 39 |
| 16 |
=0+0+0,
=0.
点评:完成本题要细心,注意数据之间的联系,灵活选择适当方法.
练习册系列答案
相关题目