题目内容
(2010?浦江县模拟)递等式计算(能简算的要简算)
①14
÷7
②4265+660÷15-36×59
③(4
-0.005×800)÷1
④266.5÷(2
×7-5
)
①14
| 7 |
| 20 |
②4265+660÷15-36×59
③(4
| 1 |
| 5 |
| 1 |
| 7 |
④266.5÷(2
| 3 |
| 14 |
| 1 |
| 4 |
分析:②、③按四则混合运算的顺序计算;
①、④可以运用乘法分配律使计算变得简单
①、④可以运用乘法分配律使计算变得简单
解答:①解:14
÷7
=14
×
=(14×
)+(
×
)
=2+
=2
;
②解:4265+660÷15-36×59
=4256+44-2124
=4300-2124
=2176;
③解:(4
-0.005×800)÷1
=(4
-4)÷1
=
×
=
;
④解:266.5÷(2
×7-5
)
=266.5÷(2×7+
×7-5
)
=266.5÷(15
-5
)
=266.5÷10.25(或
÷
)
=26.
| 7 |
| 20 |
=14
| 7 |
| 20 |
| 1 |
| 7 |
=(14×
| 1 |
| 7 |
| 7 |
| 20 |
| 1 |
| 7 |
=2+
| 1 |
| 20 |
=2
| 1 |
| 20 |
②解:4265+660÷15-36×59
=4256+44-2124
=4300-2124
=2176;
③解:(4
| 1 |
| 5 |
| 1 |
| 7 |
=(4
| 1 |
| 5 |
| 1 |
| 7 |
=
| 1 |
| 5 |
| 7 |
| 8 |
=
| 7 |
| 40 |
④解:266.5÷(2
| 3 |
| 14 |
| 1 |
| 4 |
=266.5÷(2×7+
| 3 |
| 14 |
| 1 |
| 4 |
=266.5÷(15
| 1 |
| 2 |
| 1 |
| 4 |
=266.5÷10.25(或
| 533 |
| 2 |
| 41 |
| 4 |
=26.
点评:考查四则混合运算,根据数的特点灵活运用运算定律进行简算.
练习册系列答案
相关题目