题目内容
(2012?宝应县模拟)脱式计算
(1)
+(1-
)×
(2)
÷
×14
(3)5-5×
+
.
(1)
| 8 |
| 9 |
| 3 |
| 4 |
| 4 |
| 9 |
(2)
| 4 |
| 5 |
| 7 |
| 10 |
(3)5-5×
| 2 |
| 5 |
| 3 |
| 5 |
分析:算式(1)(2)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
算式(3)可根据乘法分配律进行计算.
算式(3)可根据乘法分配律进行计算.
解答:解:(1)
+(1-
)×
=
+
×
,
=
+
,
=1;
(2)
÷
×14
=
×
×14,
=16;
(3)5-5×
+
=(1-
)×5+
,
=
×5+
,
=3+
,
=3
.
| 8 |
| 9 |
| 3 |
| 4 |
| 4 |
| 9 |
=
| 8 |
| 9 |
| 1 |
| 4 |
| 4 |
| 9 |
=
| 8 |
| 9 |
| 1 |
| 9 |
=1;
(2)
| 4 |
| 5 |
| 7 |
| 10 |
=
| 4 |
| 5 |
| 10 |
| 7 |
=16;
(3)5-5×
| 2 |
| 5 |
| 3 |
| 5 |
=(1-
| 2 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
| 3 |
| 5 |
=3+
| 3 |
| 5 |
=3
| 3 |
| 5 |
点评:在完成脱式计算题目时,要注意计算过程的完整性,中间不要有太大的跳跃.
练习册系列答案
相关题目