题目内容
脱式计算(能简便要简便运算)
(2
+2
+2
+2
)×0.25
[3.6-(1.6+
)-
]×
×[
-(
-0.25)]
7.05×37+64×7.05-7.05.
(2
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
[3.6-(1.6+
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
7.05×37+64×7.05-7.05.
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算,小数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法的意义,再运用乘法的结合律进行简算;
(2)先去小括号,再运用减法的性质进行简算,最后算括号外的乘法;
(3)先去小括号,再运用加法的交换律、结合律进行简算,最后算括号外的乘法;
(4)运用乘法的分配律进行简算.
(2)先去小括号,再运用减法的性质进行简算,最后算括号外的乘法;
(3)先去小括号,再运用加法的交换律、结合律进行简算,最后算括号外的乘法;
(4)运用乘法的分配律进行简算.
解答:
解:(1)(2
+2
+2
+2
)×0.25
=2
×4×0.25
=2
×(4×0.25)
=2
×1
═2
;
(2)[3.6-(1.6+
)-
]×
=[(3.6-1.6)-(
+
)]×
=[2-1]×
=1×
=
;
(3)
×[
-(
-0.25)]
=
×[
-
+0.25]
=
×[
+0.25-
]
=
×[1-
]
=
×
=
;
(4)7.05×37+64×7.05-7.05
=7.05×(37+64-1)
=7.05×100
=705.
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
=2
| 5 |
| 9 |
=2
| 5 |
| 9 |
=2
| 5 |
| 9 |
═2
| 5 |
| 9 |
(2)[3.6-(1.6+
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
=[(3.6-1.6)-(
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
=[2-1]×
| 3 |
| 7 |
=1×
| 3 |
| 7 |
=
| 3 |
| 7 |
(3)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 7 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
(4)7.05×37+64×7.05-7.05
=7.05×(37+64-1)
=7.05×100
=705.
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法计算.
练习册系列答案
相关题目